Located in the very farthest south portion of Illinois, Mermet Lake is well known for having regular Purple Gallinules. Other rare or difficult-t0-see species that have been found here include Neotropic Cormorant, Black-bellied Whistling Duck, Least Tern, Anhinga.

The cattail and lily-pad marshes at the north end of the lake is where the Purple Gallinules have been found. Least Bittern and King Rail have been reported here as well. Other species that can be seen along the levee road surrounding the lake include Barred Owl, Red-shouldered Hawk, Osprey, Carolina Chickadee, White-eyed Vireo, Fish Crow, Snowy Egret and Little Blue Heron.

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