1. A _______ is a mammal.   crow   crocodile   monkey   mackerel   frog   Hint Half-n-half Clue   2. A _______ is a vertebrate.   snake   starfish   3. A spider is _______.   a vertebrate   an invertebrate   4. An owl is _______.   a bird   a reptile   a fish   a mammal   an amphibian   Half-n-half Clue   5. A _______ is a fish.   sardine   lizard   dove   horse   frog   Half-n-half Clue   6. A _______ is cold-blooded.   snake   polar bear   7. A _______ is an amphibian.   newt   raven   lizard   dog   salmon   Half-n-half Clue