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3/9/2020
Chapter 6
Animals and Their Senses
I HW. Question
these following
du Morite in the Special Surses that animals
and their week sense.
hare, name what are their strong senses
1. Rats
2. Bats
3. Shakes
4. Cockroaches
5. & eagles
6. Stories Sharks
7 Whales
Answers
Answer:
1)Rats= Has hearing range between 1,000 and 90,000 Hz.
2) Bats=
Can detect warmth of an animal from about 16 cm away using its "nose-leaf".
Bats can also find food (insects) up to 18 ft. away and get information about the type of insect using their sense of echolocation.
Can hear frequencies between 3,000 and 120,000 Hz.
3) Snakes = Pit-vipers have a heat-sensitive organ between the eyes and the nostrils about 0.5 cm deep. This organ has a membrane containing 7,000 nerve endings that respond to temperature changes as small as 0.002-0.003 degrees centigrade. A rattlesnake can detect a mouse 40 cm away if the mouse is 10 degrees centigrade above the outside temperature.
The tongue of snakes has no taste buds. Instead, the tongue is used to bring smells and tastes into the mouth. Smells and tastes are then detected in two pits, called "Jacobson's organs", on the roof of their mouths. Receptors in the pits then transmit smell and taste information to the brain.
Snakes have no external ears. Therefore, they do not hear the music of a "snake charmer". Instead, they are probably responding to the movements of the snake charmer and the flute. However, sound waves may travel through bones in their heads to the middle ear.
Snakes have no moveable eyelids. Instead, they have a clear, scale-like membrane covering the eye.
4) Cockroaches = Can detect movement as small as 2,000 times the diameter of a hydrogen atom.
5) Eagles=Eyeball length = 35 mm (human eyeball length = 24 mm)
Visual acuity is 2.0 to 3.6 times better (depending on the type of eagel) than that of humans. (Shlaer, R., An eagle's eye: quality of the retinal image, Science, 176:920-922, 1972.)
6) Stories shark = Has specialized electrosensing receptors with thresholds as low as 0.005 uV/cm. These receptors may be used to locate prey. The dogfish can detect a flounder that is buried under the sand and emitting 4 uAmp of current.
Some sharks can detect fish extracts as concentrations lower than one part in 10 billion.
Some sharks sense light directly through the skull by the pineal body.
The thresher shark has an eye up to 5 inches (12.5 cm) in diameter.
The last three facts are from D.Perrine, Sharks and Rays of the World, Stillwater: Voyaguer Press, 1999.
I hope this helps.