1. A _______ is a bird.   pigeon   mackerel   salamander   cow   crocodile   Hint Half-n-half Clue   2. An _______ is an invertebrate.   amoeba   albatross   3. A toad is _______.   a reptile   a bird   an amphibian   a fish   a mammal   Half-n-half Clue   4. A shark is _______.   an amphibian   a reptile   a mammal   a fish   a bird   Half-n-half Clue   5. A spider is _______.   a vertebrate   an invertebrate   6. A mosquito is _______.   a vertebrate   an invertebrate   7. A _______ is warm-blooded.   raven   lizard