Pets

Overview
Pets are created from putting pet eggs into an Incubator Pets can be stored between sessions in a Pet Kennel (Gms Pethouse), and do not get hungry or die while inside Pets need food to survive, which can be created from either wheat or Antlion meat at an Incubator. Pets can be fed by pressing E on a Pet Food Dish or by using the "place pet food" button in the options menu when there is food in the player's inventory

Having pets out is a particularly good way to get resources that are otherwise difficult/time consuming to acquire, like tree seeds or pet eggs.

When pets die of old age at around ~90 years old, they drop a sizeable bundle of Gtokens (518-900 something, needs more data points).

Types of eggs
There are a total of 11 different egg colors currently in the game, each spawns a different species of pet that yields a specific category of items as they age. They have a chance to drop the pet egg they hatch from, as well as relics (rarely) related to the skill the egg comes from.

Info that needs more research
The range of Gtokens on pet death.