Chain Crosswords Medium Chain Math Hard — Set 23

Medium 13×13 Set 23
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Across
  1. 3. An animal with flat tail that builds dams in rivers
  2. 4. The largest animal in the ocean
  3. 7. One of the largest snakes in the world
  4. 8. A sea creature with a hard shell and pinching claws
Down
  1. 1. A black and white bird that swims but cannot fly
  2. 2. A smart ape closely related to humans
  3. 5. A large ocean fish with sharp teeth
  4. 6. A furry animal with a black mask on its face