Chandlerella quiscali, also known as the Grackle nematode, is a species of filarial nematode that parasitizes the brain of several common North American birds, namely the grackle, blue jay, brown cowbird, and starling. Due to the large area covered by the combined habitats of these bird species, Chandlerella quiscali is found throughout North America. This area diversity is further aided by the fact that 98% of grackles possess this parasite, and grackles are consistently found in various North American locations.