The Gray Bat is the largest member of its genus, weighing 7 to 16 grams.  This bat is just one color, gray which distinguishes it from other bats.  For a short period after molting , gray bats are dark gray, but their fur usually bleaches to russet between molts.
    Little is known about their actual feeding habits.  It is believed that the majority of insects eaten are water species, especially mayflies
    In the summer, they leave their winter caves and migrate to their summer range.  During this time the colonies are separated into maternity caves, where the young are reared, and into male caves which house the adult males.

Reason for the species decline:

    Disturbance by humans and vandalism is the main reason for their endangerment. Disturbing the bats  can cause thousands of babies to drop to the floor and die.  Other reasons such as pesticide poisoning, flooding and cave-ins have also caused their decline.

Protection:

    Gates have been placed across the entrance to the caves to restrict people from entering the caves and  the continuation of  regulations  to reduce pesticides in the environment that destroy bats.  Efforts have been made to buy some of the privately owned caves for protection of the bats.