Whatcom County Bats Gregory A Green Whatcom County

Whatcom County Bats Gregory A. Green

Whatcom County Bats Little Brown Bat California Myotis Yuma Myotis Long-legged Myotis Long-eared Myotis Keen’s Myotis lucifugus Myotis californicus Myotis yumanensis Myotis volans Myotis evotis Myotis keenii Big Brown Bat Eptesicus fuscus Hoary Bat Silver-haired Bat Lasiurus cinereus Lasionycteris noctivagans Townsend’s Big Bat Corynorhinus townsendii

Life History – Seasonal Hibernate Breed Emerge Migrate Forage/Give Birth

Hibernacula • Caves/Mines • Buildings • Trees Cavities • Talus?

Life History - Daily Day Roost Feed Maternal Colony Night Roost Feed

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

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