The California myotis is one of the West’s smallest bats, and Idaho’s fourteen records are spread thin across seven counties. Idaho County, the big wild county of the central mountains, holds the largest share. The rest scatter from the panhandle down toward the Snake River plain, a pattern that tracks the bat’s liking for dry, rocky country with water nearby: canyon rims, ponderosa edges, cliffs above rivers.
Nine of the records come from September. That looks like a real signal more than an artifact. Late summer and fall is when bats swarm at roost sites and move toward hibernation country, and it’s also when acoustic surveys and mist-netting crews do much of their work. A bat this small, high-flying and quiet-voiced, almost never gets noticed casually; every record is a net, a detector, or a captured animal.
NatureServe ranks it vulnerable in Idaho, though it’s secure across its full range. The low count here likely mixes genuine scarcity with how hard the species is to document. The Snake River canyon country and the forest breaks of the central mountains remain the likeliest ground. Any new record from between the known clusters would help show whether Idaho’s bats form a connected population or scattered pockets.
Full species profile
