Citations with the tag: ANIMAL orientation
Results 1 - 50
- Animal orienteering.
Curtis, Sam // Backpacker; Aug96, Vol. 24 Issue 6, p26
Focuses on animals' navigational ability. Means by which animals tell direction; Marking out a path; Homing instincts and direction sense. INSETS: Turn left at the rockies, by S. Curtis.;Beastly brief..
- Feeling the distance.
Curtis, Sam // National Wildlife (World Edition); Dec98/Jan99, Vol. 37 Issue 1, p12
Reports on findings about the ability of seals to orient themselves and find food in murky water through the use of their whiskers. Responsiveness of a seal subject to water currents while blindfolded; Hydrodynamic receptor system.
- Homing in on vertebrates.
Kirschvink, Joseph L. // Nature; 11/27/1997, Vol. 390 Issue 6658, p339
Discusses research which studied rainbow trout to investigate how organisms might sense the Earth's magnetic field and use it for navigating and homing. Research by Walker et al in this issue; Special receptor cells in sensory systems; Previous research; Magnetite and magnetoreception;...
- The Magnetic Sense.
Myers, Jack // Highlights for Children; Oct99, Vol. 54 Issue 10, p24
Focuses on the ability of animals to find their way home.
- Cave birds.
Greij, Eldon // Birder's World; Oct2007, Vol. 21 Issue 5, p56
The article presents information on oilbirds. They rely on a form of sonar called echolocation to navigate in their pitch-black homes. They do not need the precise, high-frequency echolocation of bats, which capture insects, they only have to avoid walls and ceilings. Experiments have shown that...
- ADVANTAGES AND DISADVANTAGES OF TECHNIQUES FOR TRANSFORMING AND ANALYZING CHIROPTERAN ECHOLOCATION CALLS.
Parsons, Stuart; Boonman, Arjan M. // Journal of Mammalogy; Nov2000, Vol. 81 Issue 4, p927
Presents a study which examined the advantages and disadvantages of techniques that transform and analyze echolocation calls of bats. Materials and methods; Results and discussion; Conclusions.
- The dynamics of long term exploration in the rat: Part II. An analytical model of the kinematic structure of rat exploratory behavior.
Tchernichovski, Ofer; Benjamini, Yoav // Biological Cybernetics; 1998, Vol. 78 Issue 6, p433
Abstract. A simple analytical model is proposed here that captures to a large extent the kinematic structure of rat exploratory behavior. Previous studies have shown that such behavior consists of regular excursions into the environment from a preferred place termed a home base. In the first...
- The dynamics of long-term exploration in the rat: Part I. A phase-plane analysis of the relationship between location and velocity.
Tchernichovski, Ofer; Benjamini, Yoav; Golani, Ilan // Biological Cybernetics; 1998, Vol. 78 Issue 6, p423
Abstract. Rat exploratory behavior consists of regular excursions into the environment from a preferred place termed a home base. A phase plane representation of excursions reveals a geometrical pattern that changes during exploration in both shape and size. We first show that with time and...
- Return to the Magic Well: Echolocation Behavior of Bats and Responses of Insect Prey.
Griffin, Donald R. // BioScience; Jul2001, Vol. 51 Issue 7, p555
Presents information on the history of study of the echolocation behavior of bats, or their use of sonar to avoid obstacles and catch flying insects and other prey. Importance of bats' ears for orientation when flying in the dark; Speculation by Hiram Maxim that bats might detect obstacles by...
- Echolocation by Insect-Eating Bats.
Schnitzler, Hans-Ulrich; Kalko, Elisabeth K. V. // BioScience; Jul2001, Vol. 51 Issue 7, p557
Presents a study which identifies four distinct functional groups of bats and differences in signal structure that correlate with the typical echolocation tasks faced by each group. Perceptual problems for foraging bats; Signals adapted for specific tasks; Narrowband and broadband signals; Long...
- Perceptive Bees, Birds, and Bacteria.
Gould, Stephen Jay // Natural History; Nov79, Vol. 88 Issue 9, p25
Investigates how creatures orient themselves within their environments in ways that humans cannot perceive. Correspondence between an organism's form and an engineer's blueprint; Magnet within the bodies of bacteria; Role of oriented motion in adaptive traits; Effects of gravity on humans and...
- The use of perceptual features in categorization by orangutans ( Pongo abelli).
Marsh, Heidi L.; MacDonald, Suzanne E. // Animal Cognition; Oct2008, Vol. 11 Issue 4, p569
The extent to which categorization of natural classes in animals reflects a generalization based on perceptual similarity versus an abstract conceptual representation remains unclear. Here, two experiments were conducted to identify the perceptual features used by orangutans when categorizing...
- Animal behaviour: Insect orientation to polarized moonlight.
Dacke, Marie; Nilsson, Dan-Eric; Scholtz, Clarke H.; Byrne, Marcus; Warrant, Eric J. // Nature; 7/3/2003, Vol. 424 Issue 6944, p33
Moonlight, like sunlight, scatters when it strikes tiny particles in the atmosphere, giving rise to celestial polarization patterns. Here we show that an African dung beetle, Scarabaeus zambesianus, uses the polarization of a moonlit sky to orientate itself so that it can move along a straight...
Dacke, Marie; Nilsson, Dan-Eric; Scholtz, Clarke H.; Byrne, Marcus; Warrant, Eric J. // American Heritage Student Science Dictionary; 2009, p107
Several definitions of the term "echolocation" are presented. It refers to a sensory system in certain animals, such as bats and dolphins, in which the animals send out high-pitched sounds and use their echoes to determine the position of objects. It also refers to the use of reflected sound...
- Geographic variation in the morphology, echolocation and diet of the little free-tailed bat, Chaerephon pumilus (Molossidae).
Aspetsberger, F.; Brandsen, Djuri; Jacobs, D. S. // African Zoology; Oct2003, Vol. 38 Issue 2, p245
The insectivorous bat Chaerephon pumilus has a wide distribution in Africa and displays considerable variation in the colour of its wings and venter. We investigated whether variation is also evident in its morphology, echolocation and diet by comparing a population of this species in Amani...
- VARIATION OF ECHOLOCATION CALLS OF PTERONOTUS QUADRIDENS (CHIROPTERA: MORMOOPIDAE) IN CUBA.
Macías, Silvio; Mora, Emanuel C.; Gannon, William L. // Journal of Mammalogy; Nov2003, Vol. 84 Issue 4, p1428
Echolocation calls were recorded from Pteronotus quadridens flying in the field and in an enclosed space. In the field, search calls contained 1 or 2 harmonics. Patterns of call design show a segment of quasi--constant frequency (QCF2nd-hamonic at 81-84 kHz), followed by a downward...
- Nature's navigators: The Feats.
Aziz, Laurel // Canadian Geographic; Jan2000, Vol. 120 Issue 1, p74
Focuses on the orienteering skills of animals. How interaction between navigational cues can influence how they are used; Tools and strategies used by animals to enhance their mobility.
- Built-in polarizers form part of a compass organ in spiders.
Dacke, M.; Nilsson, D.-E.; Warrent, E.J.; Blest, A.D.; Land, M.F.; O'Carroll, D.C. // Nature; 9/30/1999, Vol. 401 Issue 6752, p470
Presents research on the compass organ in the spider Drassodes cupreus, where a pair of specialized secondary eyes cooperate to analyze skylight polarization. Method of action; Structural details.
- Starfish eyes show them the way home.
MacKenzie, Debora // New Scientist; 7/13/2013, Vol. 219 Issue 2925, p01
The article looks at a study by researcher Anders Garm and team on light-sensitive eye-like organs in the tips of the arms of Linckia laevigata blue sea stars, which allow the starfish to return to their home reefs when grazing.
- Juvenile Songbirds Compensate for Displacement to Oceanic Islands during Autumn Migration.
Thorup, Kasper; Ortvad, Troels Eske; Rabøl, Jørgen; Holland, Richard A.; Tøttrup, Anders P.; Wikelski, Martin // PLoS ONE; 2011, Vol. 6 Issue 3, p1
To what degree juvenile migrant birds are able to correct for orientation errors or wind drift is still largely unknown. We studied the orientation of passerines on the Faroe Islands far off the normal migration routes of European migrants. The ability to compensate for displacement was tested...
- tropisms, theory of (c. 1912) Biology/Philosophy.
Thorup, Kasper; Ortvad, Troels Eske; Rabøl, Jørgen; Holland, Richard A.; Tøttrup, Anders P.; Wikelski, Martin // Dictionary of Theories; 2002, p535
A definition of the term "theory of tropisms" is presented. It was proposed by Jacques Loeb , a physiologist and physician who was associated with the Rockefeller Institute in New York. It refers to the concept that all the activities of animals and humans are determined by tropisms, just as...
- In the mating system of the bat Saccopteryx bilineata, bioacoustic constraints impede male eavesdropping on female echolocation calls for their surveillance.
Hoffmann, F. F.; Hejduk, J.; Caspers, B.; Siemers, B. M.; Voigt, C. C. // Canadian Journal of Zoology; Aug2007, Vol. 85 Issue 8, p863
At night, bats utter loud echolocation calls at high repetition rates that may reveal the location and current behaviour of callers to eavesdropping bats. Given the strong attenuation of echolocation calls, we predicted that territorial males of a harem-polygynous species ought to forage at...
- Do Dolphins Eavesdrop on the Echolocation Signals of Conspecifics?
Gregg, Justin D.; Dudzinski, Kathleen M.; Smith, Howard V. // International Journal of Comparative Psychology; 2007, Vol. 20 Issue 1, p65
Preliminary experimental evidence shows that it is possible for an eavesdropping dolphin to discern object information from the returning echoes generated by the echolocation signals of conspecifics. Researchers have offered suggestions as to how this proposed ability may affect the behavior of...
- WEEKLY READER:.
Gregg, Justin D.; Dudzinski, Kathleen M.; Smith, Howard V. // World Almanac for Kids; 2005, p35
The article looks at the use of echolocation by bats. Some kinds of bats use echolocation to navigate in the dark and to find insects. The bats make sounds that cannot be heard by humans. A bat knows where an insect is because the bat's sounds echo, or bounce off, an insect and return to the...
- Seeing with Ears.
Ingram, Scott // Dolphins (1-59716-161-6); 2006, p22
A chapter of the book "Dolphins" is presented. It discusses the way dolphins use echoes to help them find fish and stay away from dangerous animals. Dolphins make clicking sounds which they aim with the large, rounded part of their head. The clicks bounce off objects and return to the dolphin,...
- Mechanisms of Phototaxis in American Crayfish, Procambarus clarkii (Girard, 1852) Following Different Methods of Trapping.
Kawamura, Gunzo; Archdale, Miguel Vazquez // Journal of Fisheries & Aquatic Science; 2008, Vol. 3 Issue 6, p340
The phototactic behavior of the American crayfish Procambarus clarkii was investigated in aquaria and a large tank to determine their sensitivity thresholds to light and possible harvesting applications. Adult and juvenile crayfish were found to be positive lyphototactic and their attraction to...
- Response to: Green Light for Nocturnally Migrating Birds.
Evans, William R. // Ecology & Society; 2010, Vol. 15 Issue 3, Special section p1
The author offers a commentary on a study about the effects of artificial light on night migrating birds. This study, claims the author, has the potential to affect conservation efforts. The sample size used to base the conclusion that red light causes disorientation is criticized. Lack of...
- Laboratory observations of habitat selection in aestivating and active adult sea cucumber Apostichopus japonicus.
Yamana, Yusuke; Hamano, Tatsuo; Goshima, Seiji // Fisheries Science; Sep2009, Vol. 75 Issue 5, p1097
In order to verify which factors affect habitat selection for aestivating and in the active adult Apostichopus japonicus, animals were tested for their selection of attachment site in an experimental device (1-m pipes) in which the perceived environmental stimuli (light intensity, degree of...
- Guiding contact by coupling the taus of gaps.
Lee, David N.; Georgopoulos, Apostolos P.; Clark, Martyn J.O.; Craig, Cathy M.; Port, Nicholas Lindman // Experimental Brain Research; Jul2001, Vol. 139 Issue 2, p151
Animals control contact with surfaces when locomoting, catching prey, etc. This requires sensorily guiding the rate of closure of gaps between effectors such as the hands, feet or jaws and destinations such as a ball, the ground and a prey. Control is generally rapid, reliable and robust, even...
- Human echolocation: How to "see" like a bat.
Kish, Daniel // New Scientist; 4/11/2009, Vol. 202 Issue 2703, p31
The article offers information on human echolocation. It states that humans probably depend on echolocation far more in the days before artificial lighting, when they had to find their way round in the dark. It mentions that the first documented case of a blind person using sonar dates back to...
- Bat walking.
Kish, Daniel // New Scientist; 8/19/2006, Vol. 191 Issue 2565, p48
This article presents information on bats. Bats are flying mammals and their formal mane is Chiroptera. Their high-frequency echolocation system makes them dreaded night flyers and hunters. They have also been associated with ghosts and disease. There are 1100 bat species worldover and only...
- Harmonic-hopping in Wallacea's bats.
Kingston, Tigga; Rossiter, Stephen J. // Nature; 6/10/2004, Vol. 429 Issue 6992, p654
Evolutionary divergence between species is facilitated by ecological shifts, and divergence is particularly rapid when such shifts also promote assortative mating. Horseshoe bats are a diverse Old World family (Rhinolophidae) that have undergone a rapid radiation in the past 5 million years....
- Animal Behaviour: Eavesdropping on bats.
Fenton, Brock; Ratcliffe, John // Nature; 6/10/2004, Vol. 429 Issue 6992, p612
Discusses several studies on bat echolocation. Variation between bat species in the design of echolocation calls; Function of the wavelength of the sounds in its echolocation calls; Examples of the sophistication and the possible evolutionary and ecological consequences of variability in call...
- Harbour seals ( Phoca vitulina) can steer by the stars.
Mauck, Bj�rn; Gl�ser, Nele; Schlosser, Wolfhard; Dehnhardt, Guido // Animal Cognition; Oct2008, Vol. 11 Issue 4, p715
Offshore orientation in marine mammals is still a mystery. For visual orientation during night-time foraging and travelling in the open seas, seals cannot rely on distant terrestrial landmarks, and thus might use celestial cues as repeatedly shown for nocturnally migrating birds. Although seals...
- Are ants sensitive to the geometry of tunnel bifurcation?
Gerbier, Gr�gory; Garnier, Simon; Rieu, C�cile; Theraulaz, Guy; Fourcassi�, Vincent // Animal Cognition; Oct2008, Vol. 11 Issue 4, p637
The ability to orient and navigate in space is essential for all animals whose home range is organized around a central point. Because of their small home range compared to vertebrates, central place foraging insects such as ants have for a long time provided a choice model for the study of...
- Do chimpanzees learn reputation by observation? Evidence from direct and indirect experience with generous and selfish strangers.
Subiaul, Francys; Vonk, Jennifer; Okamoto-Barth, Sanae; Barth, Jochen // Animal Cognition; Oct2008, Vol. 11 Issue 4, p611
Can chimpanzees learn the reputation of strangers indirectly by observation? Or are such stable behavioral attributions made exclusively by first-person interactions? To address this question, we let seven chimpanzees observe unfamiliar humans either consistently give (generous donor) or refuse...
- Flexibility of cue use in the fox squirrel ( Sciurus niger).
Waisman, Anna S.; Jacobs, Lucia F. // Animal Cognition; Oct2008, Vol. 11 Issue 4, p625
Recent work on captive flying squirrels has demonstrated a novel degree of flexibility in the use of different orientation cues. In the present study, we examine to what extent this flexibility is present in a free-ranging population of another tree squirrel species, the fox squirrel. We trained...
- The Brain as a Source of Selection on the Social Niche: Examples from the Psychophysics of Mate Choice in T�ngara Frogs.
Ryan, Michael J. // Integrative & Comparative Biology; Nov2011, Vol. 51 Issue 5, p756
The main premise of this article is that various cognitive functions involved in signal analysis, memory, and decision making, all modulated by the animal�s internal milieu, can generate selection for the forms of signals used in social interactions. Thus, just as an animal�s view of its...
- Mechanical adaptations for echolocation in the cochlea of the bat Hipposideros lankadiva.
Foeller, Elisabeth; K�ssl, Manfred // Journal of Comparative Physiology A: Sensory, Neural & Behaviora; Sep2000, Vol. 186 Issue 9, p859
The cochlear mechanics of bats with long constant-frequency components in their echolocation calls are sharply tuned to the dominant second harmonic constant frequency. Hipposiderid bats employ a shorter constant-frequency call component whose frequency is less stable than in...
- Frequency discrimination threshold at search call frequencies in the echolocating bat, Eptesicus fuscus.
von Stebut, Boris; Schmidt, Sabine // Journal of Comparative Physiology A: Sensory, Neural & Behaviora; May2001, Vol. 187 Issue 4, p287
While searching for prey in open spaces, Eptesicus fuscus emits long-duration, downward frequency-modulated calls which cover a frequency band of about 28�22 kHz. In the ascending auditory pathways of E. fuscus, neurons tuned to these search call frequencies are characterised by a remarkably...
- Echolocation Calls of Pteronotus Davyi (Chiroptera: Mormoopidae) From Panama.
Ibanez, Carlos; Guillen, Antonio // Journal of Mammalogy; Aug99, Vol. 80 Issue 3, p924
Presents a study on echolocation signals broadcast by free-flying naked-backed bats (Pteronotus davyi) from Panama. Materials and methods; Results; Discussion.
- Two-Toned Echolocation Calls From Molossus Molossus in Cuba.
Kossl, M.; Mora, E. // Journal of Mammalogy; Aug99, Vol. 80 Issue 3, p929
Presents a study on the echolocation behavior in the Cuban subspecies of Molossus molossus to investigate how search calls might be adapted to match the bat's hearing capabilities and optimize chance of detecting an insect. Materials and methods; Results; Discussion.
- Dominant Glint Based Prey Localization in Horseshoe Bats: A Possible Strategy for Noise Rejection.
Vanderelst, Dieter; Reijniers, Jonas; Firzlaff, Uwe; Peremans, Herbert // PLoS Computational Biology; Dec2011, Vol. 7 Issue 12, Special section p1
Rhinolophidae or Horseshoe bats emit long and narrowband calls. Fluttering insect prey generates echoes in which amplitude and frequency shifts are present, i.e. glints. These glints are reliable cues about the presence of prey and also encode certain properties of the prey. In this paper, we...
- Phase sensitivity in bat sonar revisited.
Sch�rnich, Sven; Wiegrebe, Lutz // Journal of Comparative Physiology A: Neuroethology, Sensory, Neu; Jan2008, Vol. 194 Issue 1, p61
An echolocating bat produces echoes consisting of the convolution of echolocation call and the impulse response (IR) of the ensonified object. A crucial question in animal sonar is whether bats are able to extract this IR from the echo. The bat inner ear generates a frequency representation of...
- Reply to the comment by A. P. Grammatin on the paper 'Cat's pupil and apodization' by A. V. Lensky (Opt. Spektrosk. 107 (5), 814 (2009) [Opt. Spectrosc. 107 (5), 773 (2009)]).
Lensky, A. // Optics & Spectroscopy; Oct2010, Vol. 109 Issue 4, p621
The article discusses the vertical and horizontal resolutions of cat's pupil in response to the comment by A. P. Grammatin on the paper "Cat's Pupil and Apodization." It says that the paper covers the entire cat family (Felidae) and other animals, not only domestic cats. Meanwhile, it says that...
Lensky, A. // American Heritage Student Science Dictionary; 2009, p351
A definition for "tropism " is presented. It refers the growth or movement of a plant or animal toward or away from an external stimulus, such as light, heat, or gravity.
- Flight first, sound later.
Lensky, A. // Australian Life Scientist; 2/15/2008, p1
Fossil find suggests bats evolved the ability to fly before developing echolocation.
- Object tracking in motion-blind flies.
Bahl, Armin; Ammer, Georg; Schilling, Tabea; Borst, Alexander // Nature Neuroscience; Jun2013, Vol. 16 Issue 6, p730
Different visual features of an object, such as its position and direction of motion, are important elements for animal orientation, but the neural circuits extracting them are generally not well understood. We analyzed this problem in Drosophila, focusing on two well-studied behaviors known as...
- Cattle on pastures do align along the North-South axis, but the alignment depends on herd density.
Slaby, P.; Tomanova, K.; Vacha, M. // Journal of Comparative Physiology A: Neuroethology, Sensory, Neu; Aug2013, Vol. 199 Issue 8, p695
Alignment is a spontaneous behavioral preference of particular body orientation that may be seen in various vertebrate or invertebrate taxa. Animals often optimize their positions according to diverse directional environmental factors such as wind, stream, slope, sun radiation, etc. Magnetic...
- Reef Fish Find There's No Smell Like Home.
Slaby, P.; Tomanova, K.; Vacha, M. // Australasian Science; May2007, Vol. 28 Issue 4, p10
The article focuses on a study which discovered the importance of the ability of very young reef fish to smell their way home to the development of biological diversity on the Great Barrier Reef. According to James Cook University professor Mike Kingsford, biological diversity drives evolution...