The Hoary Bat, Lasiurus villosissimus, is often heard on our bat detectors around the reserve but up until now has not been captured for positive ID.  This is one of the most beautiful bats in the Americas and is the South American version of Lasiurus cinereus, although it was decreed a distinct species in 2015.  This one was caught in the province of Buenos Aires but it is present in Corrientes.

It is the largest of the genus Lasiurus and part of the largest family of bats, Vespertillionidae.  It has a large range from Canada (L. cinereus) through to the middle of Argentina.  It also has populations in the Galapagos and Hawaii.

It weights around 25g and has very thick fur, including over the uropatagium and the dorsal side of the wing membrane. The fur has a dark base, with a wide length of pale yellow then a cinnamon band with frosted tips.  It has medium sized ears spaced apart on either side of the head and a dark muzzle.

It has one pup per year as do most bats although twins have been recorded.  It usually roosts alone in trees, hence the need for the thick fur and is also considered migratory.