Solve these clues to fill the grid.
- A British imperial capacity unit equal to 5 fluid ounces or 142.066 cubic centimeters (plural)
- 2 Across
- The hard structure that provides a frame for the body of an animal
- 8 Across
- Warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
- 10 Across
- Massive powerful herbivorous odd-toed ungulate of southeast Asia and Africa having very thick skin
- 11 Across
- Scaly swimmer that breathes through gills
- 1 Down
- Long legless reptile that slithers
- 3 Down
- The responsive adjustment of a sense organ to varying conditions
- 4 Down
- A cut of meat taken from the side and back of an animal between the ribs and the rump
- 5 Down
- Any cold-blooded vertebrate of the class ___ including tortoises, turtles, snakes, lizards
- 6 Down
- Any warm-blooded vertebrate having the skin more or less covered with hair (plural)
- 7 Down
- Any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough
- 8 Down
- Any of various tailless stout-bodied amphibians with long hind limbs for leaping
- 9 Down
- The yield from plants in a single growing season
- 12 Down