Since the March 27 update, we've been treated to seagulls following the ship, lizards, bats and jellyfish.
So far as bats are concerned: I've seen some in a cave.
Seagulls: nothing! I did 2 runs (Outpost Plunder / Crook Hollow --- Dagger / Shipwreck Bay and no birds).
Concerning lizards: I saw none, and I did several islands (big ones).
Regarding jellyfish: frankly, they're beautiful but really totally useless: seeing 5/6 jellyfish...... that don't move at all, on not even 1m², I don't think that's great...
When they were announcing a greater variety of fauna on the seas and islands... so that there'd be more life, well in fact it's exactly the same as March 26... if you know what I mean...
I'm disappointed with this update, which I was looking forward to.