Mudskippers - skip about on muddy banks and in the shallows
Bass - cruise lakes and ponds, and sometimes leap out of the water
Catfish - lurk on the bottom by banks and boulders
Piranhas - school in the rivers, and they bite back if you wade in near them
Fishing - catch fish while you're in the water
Lake, river and sea beds - rocks, boulders and underwater cliffs
Water plants - sway with the current and part around you as you swim through
Long weed and seaweed - grow taller the deeper the water
Lily pads - float in clusters on calm lakes and ponds, drift apart when you swim through, then settle back together
Floating algae - collects around the lilies and reeds
Coming soon: Flyers - Rahonavis, Archaeopteryx and Pterodactyl
Coming soon: Swimmers - Deinosuchus (a giant prehistoric alligator), Mosasaurus and Megalodon
Fewer bugs - fewer beetles and grasshoppers, and about 30% fewer frogs and dragonflies
Frogs - hop into the water and swim
Critters - run straight away from dinos instead of zig-zagging
Spinosaurus - over three times its old swim speed, and holds its breath for 90 seconds
Underwater view - much clearer, so diving is actually playable
River ripples - bigger and less tiled, matching the lakes and the sea
Rivers and lakes - join cleanly, and the water colour blends from one into the other
Reeds and cattails - grow in thick bunches and wade out into the water
Riverbeds - sand, pebbles and mud instead of grass
Cliffs - only appear on steep ground
Fine grass - matches the two meadow greens
Rivers - now visibly flow for every player (on some machines the water looked frozen)
Tarn of the Summit - the water no longer hangs past the edge of its plateau