Animal groups are categorical

Author:
Cleary, Brian P
Cleary, Brian P., 1959
 
Showing 1 - 6 of 6
 
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1)  Butterfly, flea, beetle, and bee: what is an insect?
 
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2)  Catfish, cod, salmon, and scrod: what is a fish?
 
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3)  Dolphin, fox, hippo, and ox: what is a mammal?
 
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4)  Salamander, frog, and polliwog: what is an amphibian?
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Description:
 
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6)  Tortoise, tree snake, gator, and sea snake: what is a reptile?