1. Whatcom County Bats
Gregory A. Green

2. 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

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

4. Hibernacula
Caves/Mines
Buildings
Trees Cavities
Talus?

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

6. Maternity Roosts

7. 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)

8. Maternity Roosts
Hovander House

9. Day Roosts ♂ Tree Cavities/Bat Boxes Tree Bark Buildings
Rock Crevices/Talus
Mines/Caves
Foliage
Tree Bats

10. Day Roosts ♂

11. Hoary Bat

12. 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.

13. Bat Trees
Douglas-fir

14. Bat Trees
Cottonwood

15. Bat Houses

16. 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)

17. 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.

18. 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).

19. What do we know? Townsend’s Big-eared Bat.
Last true survey conducted by Clyde Senger ( ).
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.

20. What do we know?
Not Much