232 INDEX 



Birds {cont.) 



their songs, 81 ; mimicry, 82-3, 

 1 74-5 ; experiments, 83 ; struc- 

 ture of the ear, 1 74-6 ; location 

 of direction of sound, 175, 176; 

 use of sonar, 183, 192-3 ; smell : 

 most birds deficient in, 19, 92, 

 103; good in petrels and alba- 

 trosses, 1 98-9 ; TASTE : well- 

 developed, 19, no; touch: 

 delicate tactile perception, 19, 

 1 14-15 ; field observations, 119; 

 monitors : homing and migra- 

 tion, 225, 226-9 



Blackbirds : hearing, 73 ; alarm 

 call, 73-4 



Blind Worm. See Slow Worm 



Bloodworms, as food for newts, 44 



Brain: in man and animals, 135- 

 136; and sight, 150; of molluscs, 

 158; of whales, 188 



Bream, 191 



Bristow, W. S., World of Spiders, 23 



Brown Rat, hearing of, 75 



Budgerigars, mimicry of, 82 



Burying beetles, scenting powers 

 of, 16, 98-9 



Bush-babies (galagos), hearing of, 

 84, 86-8 



Bushby, L. C, 118 



Butterflies : sight : colour vision, 

 167; hearing: lack of auditory 

 organ, 180; smell: field obser- 

 vations and experiments on, 97; 

 male production of perfumes, 

 202 



Camouflage, 135 



Carp, 191 



Cat Fishes, 191 



Caterpillars: reaction to light, 22; 



reaction to vibrations, 76 ; sense 



of taste, no; their ocelli, 162-3 

 Cats: homing ability, 15, 226; 



good nocturnal vision, 29, 84-5 ; 



hearing, 84, 85 ; sense of taste, 



in; sense of touch, 1 20 

 Catde, 85 

 Cells, specialization of functions 



and co-ordination of, 127 



See also Nerve cells ; Receptor 



cells ; Sensory cells 

 Central nervous sytem, 131, 134 



Cephalopods, eyes of, 158 



Cephalothorax, 161 



Chameleons : unique structure of 

 their eyes, 49-50; observations 

 and experiments on their sight, 

 50-1 



Chemical sense, generalized, 215 



Chemo-receptor organs, 205-7 



Chemo-tactic organs, 90 



Chimpanzees, their sense of touch, 

 1 20-1 



Chlorophyll, its function in Proto- 

 zoa, 127 



Chub, 26 



Cicadas, auditory organs of, 1 79 



Cilia, of Protozoa, 126 



Cobra, 53 



Cockchafers, as food of owls, 62 



Cochlea of the ear, in mammals, 

 171, 220 



Cockles, eyes of, 157, 158 



Cod, 21 1 



Cold-receptor, 213 



Colour vision, 146; of birds, 26-7, 

 55-6, 156; limited vision of most 

 reptiles, 47-8 ; of lizards, 52 ; 

 most animals colour-blind, 150; 

 theories of, 1 54-5 



Common or Smooth Newt, 45 



Common or Viviparous Lizard: 

 colour vision, 47, 52 ; acuity of 

 sight, 49 ; observations on sight, 

 5 1 ; hearing, 72-3 ; observations 

 on hearing, 79-80 



Copper-head or Moccasin, 215 



Corpuscles, 208 



Crabs, their sense of taste, no-i i 



Crayfish : its touch-receptors, 211- 

 212; its statocyst, 222-3 



Crickets : stridulation, 7 1 ; experi- 

 ment on their hearing, 76; 

 auditory organs, 179 



Crocodiles, 46 ; good vision on land 

 and in water, 25, 48-9; keen 

 sense of smell, 25, 100; their 

 nictating membrane, 25 ; good 

 nocturnal vision, 49 ; hearing, 72 



Crows, mimicry of, 82, 83 



Crustacea: sense of sight, 157, 160, 

 164, 167; touch-receptors, 211 



Cuckoo, 57-8; auditory acuity, 

 81-2; migration, 225 



Curlew, its sense of touch, 92, 1 14 



