| Answer | Crossword Clue |
|---|---|
| LEMMING | Animal in a mass migration |
| ORCA | Animal whose name consists of the postal codes of two states it passes in its migration |
| CAGOLDRUSH | Mass migration of 1849 |
| ICEBRIDGE | Frozen structure that facilitates animal migration |
| SLIMEMOLD | Protoplasmic mass that's neither fungus nor animal |
