Reptiles, Amphibians, and Fish

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Across
  1. 2. the act of shedding an outer layer, such as feathers, skin, or an exoskeleton, as an animal grows larger
  2. 4. describes a species that has died out completely
  3. 6. having openings that liquids or gases can pass through
  4. 9. a type of snake that wraps around and compresses its prey
  5. 12. an aquatic vertebrate that is covered in scales, usually has fins, is ectothermic, and breathes oxygen through gills
  6. 13. relating to a 24-hr rhythm or cycle; animals that are most active during the day
Down
  1. 1. relating to the night; animals that are most active at night
  2. 3. an animal having vertebrae or backbones
  3. 5. a toxin capable of causing injury or death through injection into prey
  4. 7. an animal that depends on external sources for its body heat
  5. 8. vertebrate that has wet skin, can live in water or on land, is ectothermic, and typically breathes oxygen through its skin, gills when young, and lungs as an adult
  6. 10. allowing certain substances to pass through
  7. 11. vertebrate that has scaly skin, is ectothermic, breathes oxygen using lungs, and lays eggs