Here are some tips about the Otter:

1-If you sent it to kill fish, it might give black pearls too.

2-If you are freezing, equip an Otter on your shoulders and it will keep you warm from the cold. (You can also use tek canteens with water that is set to hot mode to prevent freezing, and it can be the other way around, use cold water in a tek canteen to prevent overheating).

3-These are not the cutest creatures... why do i feel like my walls are gonna fall over?

-Pablo