Also i think you Discworld fans would love this Fauna its called a Zaratan there a species of turtles known for there gigantic size and docile behavior (pictured below)
[img]http://4.bp.blogspot.com/-TnmIIACvXS4/TibwSzbPRxI/AAAAAAAAAGM/7zINbr9bGDU/s1600/zaratan.jpg[/img] as you can see above me they are the size of an small island (actually can you call that island) When a Zaratan get hungry, it opens its mouth wide and releases a sweet smell. Fish are attracted to the odor and swim in, when its mouth is full it snaps its jaws shut. There found all around Marduk.