Along the mudflats of Garantia exist two types of annelids: earthworms and lugworms  Earthworms tend to emerge from the mud early in the morning when there is more moisture and nutrients  As a result, earthworms have access to more nutrients and thus reproduce far faster than the lugworm, which spends much of the day submerged in the mud
Nonetheless, the lugworm population far outnumbers that of the earthworm
The whooping crane, the earthworm's chief predator, hunts along the mudflats during the time the earthworms are feeding at the surface.