Here is the completed crossword puzzle based on the provided animal names and clues:
| # | Word | Meaning/Clue |
| 1 | WHALE | Large marine mammal. |
| 2 | ELEPHANT | Largest land mammal with a trunk. |
| 3 | PONY | A small horse. |
| 4 | SNAKE | A long, legless reptile. |
| 5 | HIPPO | Large, thick-skinned, herbivorous mammal of Africa. |
| 6 | PARROT | A tropical bird, often brightly colored, with a strong curved beak. |
Answer: The crossword puzzle has been completed with the words WHALE, ELEPHANT, PONY, SNAKE, HIPPO, and PARROT.