Lasiurus ega (Southern Yellow Bat)

Weight: 10-15 grams

Wingspan: 34-36 centimeters

[Call File1] [Call File2]



From southern Texas through eastern Mexico and Central America into southern South America.


Ecology and Behavior:

This bat has a pale-tan color with a grayish wash both ventrally and dorsally. It has pale ears, a pale tail membrane, and dark wing membranes. Like other members of the genus Lasiurus, the southern yellow bat is a tree-roosting species; it often roosts individually on the bark of trees. Palm trees are a common roosting site; most records in the United States are along the Rio Grande near Brownsville, Texas, where it inhabits a natural grove of palm trees. It may be migratory in parts of its range, but it seems to be a year-round resident of the Brownsville area, where it is known to occur in six different months, including December. It does not hibernate, but it does undergo daily torpor. In Venezuela, it usually occurs at elevations below 500 meters (1,650 feet), and is strongly associated with moist habitats and multistratal tropical evergreen forest.

Food Habits:

Small to medium-sized, night-flying insects are the main food items.

Reproduction and Longevity:

Pregnant individuals have been recorded in April and June. One litter of two to four babies (average is 2.9) is born in late-April, May, June, or July. Young are capable of breeding in their first year.

Status of Populations:

Rare in the United States, but is common in the southern extreme of its range in Paraguay, Uruguay, and Argentina.

Text, in its original form, provided by T. L. Best, M. J. Harvey, and J. S. Altenbach. Printed spectrographs provided by M. J. O'Farrell. Distribution maps, call descriptions, and AnaMusic sound clips produced by W. L. Gannon. Accounts assembled by T. C. Sanchez-Brown.