The planters

The planter(s) are wild native animals found in From Dust, they only appear upon the player reaching half the vegetation bar, inwhich they will live and feed close to the villages. However if the island's vegetation decreases due to any cause, the planters will flee at once. If planters walk on dirt, a trail of small, brightly orange and red colored plants seem to follow in their trail, making it easy to find out where these are. The plants they spawn do not grow over other plants or underwater, though they seem to be able to survive shallow, slow moving waters.

Description
Its quite common for the player to mistaken the Planters as large grubs or slugs, however they are a fictional mammals and made soley for the game. They serve no other purpose other than decoration, and the player has no control over the planters.