Mudpuppies are fairly large gilled salamander. The gills are dark red. A female mudpuppy constructs a nests by excavating under rocks, logs or other cover in submerged bottom sediments. Eggs are attached by the outer envelopes with a short stalk. Females can lay at least 12 eggs in a day. The eel like mudpuppy is nocturnal. mudpuppies inhabit vegetation-choked or muddy habitats during the day. They normally walk or crawl over the bottom but are capable of rapid bursts of speed when disturbed. Mudpuppies are not fish they are amphibians.