 Initially blind and hairless, their eyes open around the fifth day, and they are completely furred by day nine.In May 2017, the lethal fungal disease white-nose syndrome was recorded in this species for the first time, in the second recorded case in Washington state.This discovery brings the total number of bat species affected by the disease up to eight (an additional seven species have been documented with the spores on their bodies, but without the symptoms of the disease).