For gathering with the otter you don’t always have to pick him up and double tap F for him to gather and attack targets you can use the whistle command “attack this target” and it does the same thing but without having to pick him up and double tap F and he doesn’t have to be on your shoulders.
What I do is I throw him off my shoulders I go and kill the fish myself and once I got a good group of dead fish I just use whistle “attack this target” and he gathers the meat and pearls from the dead body. Hope this helps for anyone that was constantly picking the otter up and double tapping F to gather.
Otter babies are very easy to raise, as they hold and entire 25 pounds of fish meat when first born. Not sure if this is an oversight, but just fill it with meat once, then refill a few more times before it hits juvenile. Can be hard to claim when first born because they tend to bounce all over the place. Overall very fun and easy to raise.
Like Kairuku and Dimetrodons, Otters can provide insulation based on their damage status. They are, however, easier to tame and can be carried on shoulder opposed to Dimetrodons, with a smaller hitbox than both the other two while retaining a good insulation capacity, so it's possibly to easily gather as many as 12 around a single egg.
On the con side, their insulation AoE is quite small, so hatching multiple eggs might require a ton of them, wasting creature slots. They have a very low Food stat as well, moreover they are mammals and thus cannot have their genetics stored in the form of eggs inside fridges, so stay ready to feed them fish every 4-5 days.
Otters also act like structure storage units, so one can use them to carry as many Artifacts as it wants.
Level up Melee Damage for portable ACs and living scarfs, Weight for Artifact backpacks and Food as a security measure on breeding stock.
If you plan to keep some at your base, don't rely on your feedig trough... Rexes apparently eat fish (before meat), and eat a LOT. Couldnt figure out why mine were dying until I realized my rexes were eating all my otter's fish.