1. A _______ is a bird.   crocodile   cow   mackerel   pigeon   salamander   Hint Half-n-half Clue   2. A shark is _______.   a fish   a mammal   an amphibian   a reptile   a bird   Half-n-half Clue   3. A _______ is a vertebrate.   jellyfish   herring   4. A snake is _______.   a mammal   a reptile   a bird   an amphibian   a fish   Half-n-half Clue   5. A _______ is an amphibian.   dog   raven   lizard   salmon   newt   Half-n-half Clue   6. A mosquito is _______.   a vertebrate   an invertebrate   7. A _______ is cold-blooded.   polar bear   snake