Facts

Larva: Eats EVERYTHING!!! You're lucky it's no bigger than an adult human's foot. They're slow and kinda dumb.

Juvenile: Diet slowed significantly. But it's more aggressive, it's half the height of the average person, it's really fast, intelligence increased significantly.

Adult: Ridiculously intelligent, extremely dangerous.

Fun fact: Xenoids(more specifically the larva) start out genderless. Their gender is decided by chemical reactions against each other. Say a larva tends to be by itself, it will become a male. If the larva tends to hang out with other Xenoids, whether the aliens they're with are larva or not, they will be female.