Savage Gorilla

{U}{B}, {T}, Sacrifice Savage Gorilla: Target creature gets -3/-3 until end of turn. Draw a card.

Gorilla Titan

Trample
Gorilla Titan gets +4/+4 as long as there are no cards in your graveyard.

River Bear

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Silverback Ape

Gorilla Berserkers

Trample; rampage 2 (Whenever this creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it beyond the first.)
Gorilla Berserkers can't be blocked except by three or more creatures.

Balduvian Bears

Gorilla Chieftain

Pale Bears

Apes of Rath

Whenever Apes of Rath attacks, it doesn't untap during its controller's next untap step.