1. A _______ is warm-blooded.   lizard   raven   2. A _______ is a vertebrate.   starfish   snake   3. A _______ is a mammal.   mackerel   crocodile   monkey   frog   crow   Hint Half-n-half Clue   4. _______ is a reptile.   An albatross   A fox   A frog   A sardine   An alligator   Half-n-half Clue   5. A _______ is a fish.   frog   lizard   horse   sardine   dove   Half-n-half Clue   6. A toad is _______.   a mammal   a bird   an amphibian   a fish   a reptile   Half-n-half Clue   7. An _______ is an invertebrate.   albatross   amoeba