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2006-11-02 22:18:36 · 6 answers · asked by navaneeth p 1 in Science & Mathematics Zoology

6 answers

Bats - so high they are not audible to humans

2006-11-02 22:21:59 · answer #1 · answered by Anonymous · 1 0

Hope you wanted the loudest animals in the world,cause thats what I know:-
Loudest in water-blue whale,its low frequency sounds are as loud as 188 decibles-louder than a jet engine.It can be detected over 500 miles.
Loudest on land-howler monkey,whose howls can be heard over 3 miles.

2006-11-02 22:55:42 · answer #2 · answered by farhan ferdous 4 · 1 0

dinosaur

2006-11-02 23:12:49 · answer #3 · answered by guharamdas 5 · 0 0

my dog lol

2006-11-02 22:21:19 · answer #4 · answered by Anonymous · 0 0

the sperm whale produce the highest sound in the aminal kingdom because When sperm whales dive, they start to produce regular clicks at depths of several hundred meters, and they continue clicking during the descent and bottom phases of the dive. Data from dtagged sperm whales suggests that sperm whales use echoes from the sea surface and sea floor to orient in the water column and to avoid colliding with the seafloor while maneuvering near it. This collision avoidance and orientation function benefits from omnidirectional elements of the sperm whale regular clicks. In addition, as whales dive, they appear to direct a beam from the regular clicks to detect echoes from the depth at which they will be feeding. This suggests that sperm whales may locate the most profitable patches of prey during the descent. As discussed in earlier talks in this series, sperm whales also produce more rapid runs of clicks, called creaks. The behavior of whales during creaks suggests that this represents the period between detection and capture of prey. Creaks can thus be used as an indicator of foraging success.

All of the ways sperm whales use sound that have been listed above, may be disturbed by manmade noise. I describe controlled experiments in which tagged sperm whales are exposed to controlled doses of manmade noise. The corresponding responses of sperm whales will be described in terms of avoidance, dive patterns, and creak rates (used as a proxy for foraging).




"Biomechanics and dynamics of the biggest nose on record"
Dr. Peter T. Madsen
Woods Hole Oceanographic Institution, Biology Department
Formerly with Dept. of Zoophysiology, University of Aarhus, Denmark

Abstract
The sperm whale carries a huge nasal complex that may make up 1/3 of the body length, and reach a weight of more than 10 tons. The structures of this giant nose are homologous with sound generating nasal structures of dolphins, and it has been proposed that the sperm whale nose acts to generate sound. It has recently been demonstrated that the sperm whale nose is a sound generator, and that it generates the highest sound pressures ever measured in the animal kingdom. This talk will present data to suggest how sounds are produced and propagate in the sperm whale nose, and how clicks with very different properties are generated. Finally, the different click properties will be discussed in light of possible use for foraging and communication, and a theory will be advanced to account for the evolution of the world's largest biological sound generator.




"3D beampattern of sperm whale clicks"
Dr. Walter M. Zimmer
NATO Undersea Research Centre, La Spezia, Italy

Abstract
While deep diving, sperm whales (Physeter macrocephalus) produce loud clicks, called regular or usual clicks, with an Inter-Click-Interval (ICI) of 0.5 to 1.5 s. The purpose of these clicks was long disputed. Most biologists assumed by analogy with the better-studied biosonar of bats and dolphins that regular clicks are used for echolocation of prey. However, several bio-acousticians have argued that the observed mean source level (160-180 dB//1µPa@1m) and the lack of significant directionality were not compatible with successful echolocation. Recent measurements suggest that regular clicks are highly directional, with source levels of up to 235 dB//1µPa@1m on the axis of the sound beam. Here we confirm the existence of a narrow forward beam, but observe that significant energy is also emitted as a broader beam in the backward direction. Whatever the orientation of the whale, it receives echoes from the surface throughout the dive, and from the bottom whenever it is near. This suggests that sperm whales use a narrow sonar beam to search for possible prey, and a less directional component of the signal for orientation and obstacle avoidance.




"Foraging dives of sperm whales: costs and benefits of diving deep to feed"
Dr. Patrick J. O. Miller
Royal Society International Fellow
University of Saint Andrews, Scotland

Abstract
Sperm whales are highly successful deep-sea predators, displaying a cosmopolitan distribution and a diverse prey base. Because of the required long transit to deep food patches, the ability to remain at the bottom of deep dives for long periods of time is critical for the foraging efficiency of this animal. Indeed, sperm whales appear to have lower foraging costs than similarly large fin and blue whales. From data collected with D-tag, we find that the sperm whale has evolved a hydrodynamic body form that reduces drag forces, and that whales make extensive use of glides to take advantage of buoyancy during ascent and descent. We present evidence that sperm whales emit stereotyped rapid click trains called "creaks" during prey capture. Using creaks as a marker of prey capture, we are able to investigate feeding rates of sperm whales and describe their foraging behavior. The combination of low drag experienced by steady swimming sperm whales, near-neutral buoyancy at depth, and extensive use of glides during ascent and descent appear to effectively reduce costs for sperm whales to forage for prey at depth.

2006-11-02 23:11:07 · answer #5 · answered by zigazagie 2 · 0 0

donkeys- they don't shut up!

2006-11-02 22:22:36 · answer #6 · answered by ***clumsy clam*** 3 · 0 0

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