Whatcom County Bats Gregory A. Green
Whatcom County Bats Little Brown Bat Myotis lucifugus California Myotis Myotis californicus Yuma Myotis Myotis yumanensis Long-legged Myotis Myotis volans Long-eared Myotis Myotis evotis Keen’s Myotis Myotis keenii Big Brown Bat Eptesicus fuscus Hoary Bat Lasiurus cinereus Silver-haired Bat Lasionycteris noctivagans Townsend’s Big Bat Corynorhinus townsendii
Life History – Seasonal Hibernate Breed Emerge Migrate Migrate Forage/Give Birth
Hibernacula Caves/Mines Buildings Trees Cavities Talus?
Life History - Daily Day Roost Maternal Colony Feed Feed Night Roost
Maternity Roosts
Maternity Roosts Myotis – buildings or under bridges Big Brown Bat – buildings or tree hollows Townsend’s Big-eared Bat – cave/mine Silver-haired Bat – foliage, bark, tree cavity Hoary Bat – foliage (Douglas-fir)
Maternity Roosts Hovander House
Day Roosts ♂ Tree Cavities/Bat Boxes Tree Bark Buildings Rock Crevices/Talus Mines/Caves Foliage Tree Bats
Day Roosts ♂
Hoary Bat
Similar to Day Roosts, except remain in vicinity of foraging area. Night Roosts ♂ Similar to Day Roosts, except remain in vicinity of foraging area. Place to digest before morning feed. Less need to hide due to night cover.
Bat Trees Douglas-fir
Bat Trees Cottonwood
Bat Houses
Whatcom Perspective Protect large snags, especially cottonwood and Douglas-fir. Protect maternal colonies; provide bat condos where building colonies are threatened. Protect caves/mines. Townsend’s Big-eared Bat (Survey)
What do we know? Three known maternity roosts. Hovander House with several hundred Little Brown Bats and Yuma Myotis. P. Otto house with a colony of Western Long-eared Myotis. Lake Terrell Barn with Little Brown Bats at one end and Big Brown Bats at the other.
What do we know? Two suspect maternity roosts and a curious roost. Old Marietta School. Grand View Signs & Awning. Otto Preserve Barn (Five species of Myotis).
What do we know? Townsend’s Big-eared Bat. Last true survey conducted by Clyde Senger (1964-1981). Small numbers (1-4) hibernating at Chuckanut Caves (larger numbers at Oyster Dome, Skagit Co.). Multi-year summer roosts at four house (1-3 bats). Single years at nine others.
What do we know? Not Much