Regardless of how they got here, they are among our herpetofauna and with a possible length of up to 17", would be our largest.
Mudpuppies are aquatic and active year round. The gills on the sides of the neck are large, red and feathery. They have a heavy-bodied primordial look to them.
Apparently, they are attracted to light - something I am going to try one of these days. They also end up on the hooks of fishermen.