1. A _______ is a fish.   lizard   frog   horse   sardine   dove   Hint Half-n-half Clue   2. A spider is _______.   an invertebrate   a vertebrate   3. A _______ is a bird.   crocodile   cow   mackerel   pigeon   salamander   Half-n-half Clue   4. A _______ is a vertebrate.   starfish   snake   5. A shark is _______.   a fish   a mammal   a bird   a reptile   an amphibian   Half-n-half Clue   6. A snake is _______.   a bird   an amphibian   a mammal   a reptile   a fish   Half-n-half Clue   7. A _______ is a vertebrate.   herring   jellyfish