284 



Index 



Tuna, 206 



body temperature, 208 



caeca, 143 



habitat, 206, 208, 209 



kite-lure, 207 



size, 208 



speed of, 208 



Urinary bladder, 152 

 Urine formation, 150, 151 



Vertebrae, extra in humans, 11 

 Vertebrate, definition of, 7 

 Visual sensations, 90 



Wallace, Alfred Russell, 13 

 Weberian ossicles, 129, 131 



illustrated, 130 

 Weight-length ratio, 170, 1 71 

 Whale, 13 

 Workers, 232 



Xyfhofhorusy 268 



Yield, maximum sustained, 224- 



225 

 Yohimbine, 43 

 Yolk-sac, 169 



