Made a hybrid to resemble D-rex
The sperm whale was to add the bulbouse head, pluss echolocation and blubber for warmth becouse wtf not?
Trex becouse duh
Silverback to add muscle and fur for more warmth as well as higher iq and more instincts to use its arms
The spino to add a bit more swimming instinct and help with the knuckle walking as well as a bit of a sail to help support muscle
Allasaurus for hook like claws