COMPARATIVE ANATOMY 



Bird — Class Aves 



The chief distinguishing character of birds is the presence 

 of feathers, which are found nowhere else in the animal kingdom. 

 Examine also the horny beak, the fore-limb modified for flying, 

 and the scales on the legs. The scales are homologous to the 

 scales of reptiles. As in reptiles, skin glands are restricted in 

 number and distribution. 



Cat — Class Mammalia 



The cat is so familiar that a detailed study of its external 

 anatomy is not necessary. However, examine a specimen as 

 opportunity arises and observe particularly the following: 



1. The vihrissae or tactile hairs on upper lips, cheeks, and 

 above the eyes. 



2. The absence of hairs in certain regions of the body. 



3. The retractile claws. 



4. The soft pads on the soles of the feet. 



5. The remnant of the nictitating membrane. 



