- Turritopsis nutricula Immortal jellyfish is the only species known to live forever.
2. Butterflies taste with their feet.
3. Sea otters hold hands when they sleep to keep from drifting apart.
4. Squirrels plant thousands of new trees each year simply by forgetting where they put their acorns.
5. Gentoo penguins propose to their lifemates with a pebble.
6. Oysters can change gender depending on which is best for mating.
7. Seahorses mate for life, and when they travel they hold each others’ tails.
8. Squirrels will adopt other squirrels babies if they are abandoned.
