mob ideas need

mob, mini boss/boss and item ideas needed.

its all prehistoric creatures and stuff.

ideas so far:

mobs:

peaceful:
gomphotherium-a big a mammoth like thing. it acts like a big sheep it can be sheared for its fur. drops gomphotherium fur

dodo-like a chicken but can be tamed with something (dont know what). drops dodo feathers.

sloths: like villagers but can be traded with only if you give them an apple and it is random what you get. they spawn in trees and drops sloth fur.

neutral:

megatherium-a giant sloth thingy. its will be kinda be like a iron golem just only attacks things that attack it or other sloth things.
trops sloth fur.

monsters:

t-rex-the minecraft version of one of the most known dinosaur. drops t-rex teath

cavemen-these are like zombies but hit you with a club. spawns in cave biomes and drops clubs

mini-bosses:

tough cave man-a stronger cave man summons cavemen to attack you. spawns in the main cave. crops the club of the light

giganotosaurus- a creature bigger and stronger than a t-rex. they bite you and spawn small versions of itself out. drops dino claw

Majungasaurus-this is also like a big t-rex but attacks even its own kind it. this creature is the strongest dinosuar in the dimension (other than mini bosses). drops Majungasaurus heart.

bosses:

predator X-as sea creature that is huge it kills other sea creatures that are at least 2 blocks big. drops the predator scales.

more will be added any ideas plz post them