1. A spider is _______.   a vertebrate   an invertebrate   2. A toad is _______.   a mammal   an amphibian   a fish   a bird   a reptile   Hint Half-n-half Clue   3. A _______ is a bird.   crocodile   salamander   cow   pigeon   mackerel   Half-n-half Clue   4. A snake is _______.   a reptile   a bird   a fish   a mammal   an amphibian   Half-n-half Clue   5. A _______ is a vertebrate.   starfish   snake   6. An owl is _______.   a fish   a bird   a mammal   a reptile   an amphibian   Half-n-half Clue   7. A _______ is an amphibian.   salmon   lizard   dog   newt   raven   Half-n-half Clue