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White-lined bats are some of the most conspicuous bats you are
likely to see while visiting the Osa Peninsula. These clever little
bats are fond of using the overhangs of houses, or ecolodges, as
their roosts and have learned to coexists with humans even in very
There are two species of
White-lined Bats in Costa Rica and they are both very similar: the
Greater White-Lined Bat (Saccopteryx bilineata) and the
Lesser White-lined Bat (Saccopteryx leptura). The
Brazilian-long Nosed Bat is the
only other Costa Rican bat with two white lines on its back, but it
is easily distinguished by its flecked, grayish fur and very long
White-lined Bats are quite small, with adults normally measuring
about 5 centimeters. They are also called Sac-winged Bats because
they have a sac shaped scent gland on their wings, near the forearm.
These adorable little bats normally live in small harems made up of
one male and up to eight females, but colonies of up to fifty bats
have been documented. These large colonies are usually made up of
several coexisting harems. Females will frequently switch to other
harems while males normally remain tied to their territories.
White-lined Bats are strict insectivores. They normally begin
foraging while it is still light out and hunt through the night.
While foraging they fly at an average speed of 5.75 meters per
second and eat mostly small beetles and flies. Males normally defend
a foraging territory and each female in the harem has her own
foraging territory within that space.
As they return to their daytime roosts, after a long night of
hunting, the male will serenade each of his returning females. They
will indulge in long, complicated songs which are audible to humans.
As they sing, they will periodically hover in front of the females
and perfume them with their scent.
The perfume, which is also easily detected by humans, is released
from the scent sacs on their wings. This ritual may take place
several times throughout the day. Rival males will also partake in
long "scent flights" with one another, specially when their
territory shares a common border.
Despite all of the singing, displaying, and perfuming, copulation
for the Greater White-lined Bat only takes place during a short
period late in the rainy season. Females give birth to their pups in
May, in sync with the return of the rains. This pattern is different
in the Lesser White-lined Bat, and females may produce two litters.
In this case they will give birth in May and in October or November.
newborn bats suckle for several months, although they can
usually fly on their own when they are two weeks old. Females provide all the parental care to the young bats. Each night, when
females go out and forage, they take their pups away from the
daytime roost to a secret hiding place for them to pass the night
safely. Each pup has its own hiding spot. In the morning they
retrieve the pups and return with them to their daytime roost.
and September, when they are three to four months old, the new
generation of White-lined Bats will leave the harem. Studies have
shown that females consistently leave the area, while about half of
the males will attempt to establish their own harems nearby.
2005 Travellers' Wildlife Guides Costa Rica
Janzen, D. 1983 Costa Rican Natural History
University of Chicago Press
LaVal, R. & Rodriguez, B. 2002 Murcielagos de Costa Rica/Bats
Wainwright, M. 2002 The Natural History of Costa
Rican Mammals Zona Tropical
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