You can pickup anything by right-clicking them with your empty hand, as long as you are big enough
Animals and players alike can be picked up and kept in your inventory. However, players must be kept in your equipment slots or hotbar, and trying to shove them into chests will drop them to the ground instead. Animals and other entities can very well be stored in chests.
Organic entities (animals, players, monsters; just not minecarts or boats) can be eaten for food value. Refer to consumption section for more.
Dropping the item to the ground releases the entity, so tinies can be put in droppers or dispensers to release them this way.
To pickup players, you additionaly need to have the holding system enabled. The holding system allows entities to exist in the world while you hold them as items, which is required for players since they may not be deleted from the world.
By default, beegs can use their size to pickup entities as items, this can be disabled in the Server Config:
actuallysize-server.tomlÂ
# This enables this feature in which beegs can pickup tinies
allowPickup = true
# This disables this feature in which beegs can pickup tinies
allowPickup = false