The silvery salamander averages four to six inches in length. The body is brown, gray or blue-black. Blue ﬂecks may be present on the lower body.
The silvery salamander may be found as a native population in Vermilion County (east central Illinois) and an introduced population in Cook County. The native colony in Vermilion County lives in a wooded upland and an adjacent ravine. Breeding occurs in a nearby vernal pool that dries out in mid-to-late summer or earlier. The silvery salamander spends most of the time underground except for a short period when mating occurs. This salamander is an all female, triploid species containing two sets of chromosomes derived from the Jefferson salamander and one from the blue-spotted salamander. To activate egg development, the female mates with a male of a different species (small-mouthed salamander), but the sperm makes no genetic contribution to the offspring. Eggs are deposited in water and attached to vegetation. Young salamanders transform into the adult, land-based form in summer. This animal eats invertebrates.