2. Inventory Group

Data on the biology, natural history, and distribution, including range maps, of the 16 species of bat found in British Columbia can be found in Nagorsen and Brigham (1993), and van Zyll de Jong (1985). Table 1 summarizes relevant background biology for each of these species.

Table 1. Species of bat found in British Columbia and relevant natural history (information from Nagorsen and Brigham, 1993; British Columbia 1996 Red and Blue List for Terrestrial Vertebrates).

Species	Provincial Status Listing	Overwinter Strategy	Roosting Strategy	Mass (g) Mean (range)
Spotted Bat (Euderma maculatum)	Blue	Hibernates	Colonial	17.9 (16.2-21.4)
Townsend's Big-eared Bat (Plecotus townsendii)	Blue	Hibernates	Colonial	8.6 (6.0-13.5)
Pallid Bat (Antrozous pallidus)	Red	Hibernates	Colonial	17.0 (12.0-24.3)
Big Brown Bat (Eptesicus fuscus)	Yellow	Hibernates	Colonial	15.2 (8.8-21.9)
Western Red Bat (Lasiurus blossevilli)	Red	Migrates	Solitary	10.8 (7.2-18.5)
Hoary Bat (L. cinereus)	Yellow	Migrates	Solitary	31.5 (20.1-37.9)
Silver-haired Bat (Lasionycteris noctivagans)	Yellow	Migrates Hibernates?	Colonial?	9.0 (5.8-12.4)
California Myotis (Myotis californicus)	Yellow	Hibernates	Colonial	4.4 (3.3-5.4)
Western Small-footed Myotis (M. ciliolabrum)	Blue	Hibernates	Colonial	4.6 (2.8-5.5)
Western Long-eared Myotis (M. evotis)	Yellow	Hibernates	Colonial	5.5 (4.2-8.6)
Keen's Long-eared Myotis (M. keenii)	Red	Hibernates	Colonial	5.1 (4.0-5.9)
Northern Long-eared Myotis (M. septentrionalis)	Red	Hibernates	Colonial	6.5 (5.0-10.0)
Little Brown Myotis (M. lucifugus)	Yellow	Hibernates	Colonial	6.2 (6.2-10.4)
Fringed Myotis (M. thysanodes)	Blue	Hibernates	Colonial	7.1 (5.4-8.4)
Long-legged Myotis (M. volans)	Yellow	Hibernates	Colonial	7.2 (5.5-10.0)
Yuma Myotis (M. yumanensis)	Yellow	Hibernates	Colonial	6.6 (4.0-8.5)