-Large Birds fly around when you are sailing the seas. They can swoop down and grab your crewmates. The birds go down in 1 hit, but once they have grabbed you, you can only hit them with a sword. Swording 3 times will drop you from the birds grasp.
Birds Carry you to circles of sharks.
-Whales that if bumped into, will spray water up, knocking your ship to the side.
-Crabs spawn on all islands and can pinch you, but only if they are threatened.
-Squids will flee from you but drop large ink sacks that can be thrown to blind enemies when the squid is killed.
-Jaguars can randomly spawn on larger islands in the Ancient Shores and move quickly, making them harder to kill
-Spiders spawn in all islands in the Ancient Shores and bite dealing poison when stepped on or walked into. They also leave webs that can slow pirates.
-Black Caiman spawn on larger islands in the Wilds near water, and have a lot of health and a strong bite. They sneak up on you.
Scorpions spawn in all islands in the Wilds and sting when stepped on but do not deal poison.
-Anacondas spawn in the Shores of Plenty and wrap around your character, requiring a sword or teammates to free you from it.
-Sea Urchins spawn in the beaches of The Shores of Plenty and cripple when stepped on.
Okay so basically thats about it. Something to make the biomes more unique and with slight gameplay differences. Also the birds is the most important thing here, so if you dont like anything else please like the birds.