||The Mammals of Texas -
Northern Yellow Bat
Chiroptera : Family
Vespertilionidae : Lasiurus intermedius H. Allen
Description. A large, yellowish-brown bat
with short ears and long, silky fur; membranes brownish;
membrane between hind legs well haired on basal third or
half, the terminal half and underside are nearly naked.
Dental formula as in L. ega.
External measurements average: total length, 140 mm;
tail, 51 mm; foot, 11 mm; forearm, 58 mm.
Distribution in Texas. Eastern and
southern parts of state as far north as Shelby County and
as far west as Bexar County.
Habits. Little is known about
this uncommon bat. The distribution of this bat in the
United States closely coincides with that of Spanish
moss, which is its preferred roosting site. In South
Texas, however, these bats roost in palm trees, where
they are well concealed beneath the large, drooping
fronds. A single roosting site may contain several bats
and such groups are often quite noisy, especially when
young are present, and their bickering gives them away
from below. Migration and winter habits are poorly known.
Northern yellow bats forage over open,
grassy areas such as pastures, lake edges, golf courses,
and along forest edges. In Florida they often form groups
while feeding. Such foraging groups are segregated by
sex; males are rarely found in such groups, and they seem
to be more solitary in their habits than are females.
Specific prey items include leafhoppers, dragonflies,
flies, diving beetles, ants, and mosquitoes.
Females carry three to four embryos in
spring and litter size is believed to usually be two or
three. Parturition probably occurs in late May or June in
Photo credit: John L. Tveten.