Reserva Ecológica Costanera Sur

Sitio realizado por aficionados a la observación de aves desde 10 de enero 2006

Peters' Mastiff Bat - Eumops bonariensis

Order Chiroptera - Family Molossidae

It ranges from the southern of Mexico to Central Argentina. It is insectivorous.

Eumops bonariensis10 10 15 © Marcelo Leanes Eumops bonariensis10 10 15 © Eduardo Soriano Grandes
Eumops bonariensis10 10 15 © Judith Sandberg Eumops bonariensis10 10 15 © Sergio Cusano
Eumops bonariensis10 10 15 © Eduardo Soriano Grandes Eumops bonariensis10 10 15 © Judith Sandberg
Eumops bonariensis10 10 15 © Sergio Cusano Eumops bonariensis10 10 15 © Eduardo Soriano Grandes
Eumops bonariensis10 10 15 © Judith Sandberg Eumops bonariensis10 10 15 © Sergio Cusano
Eumops bonariensis10 10 15 © Sergio Cusano Eumops bonariensis10 10 15 © Sergio Cusano


Eumops possibly bonariensis photographed on September 27th 2015
Phillostomido/Phyllostomid© J. Simón Tagtachian Phillostomido/Phyllostomid© J. Simón Tagtachian
Phillostomido/Phyllostomid© J. Simón Tagtachian Phillostomido/Phyllostomid© J. Simón Tagtachian
Phillostomido/Phyllostomid© J. Simón Tagtachian Phillostomido/Phyllostomid© J. Simón Tagtachian
At first this bat was considered a phyllostomid. Two characteristics supported this opinion: the nose leaf (not clearly seen in the photo) and the absence of a loose tail extending beyond the uropatagium (membrane which connects hind limbs and enclose totally or partially the tail).

Olga Vaccaro sent the photos to the PCMA (Program of Bat Conservation of Argentina) and Rubén Barquez and César Bracamonte, specialists in the subject gave their own opinion. For them this is an Eumops

Rubén Barquez thinks he can not see any genus or species in the area with this look. What is not so clear to him is that the bat is flying during the day, except the photo gives that impression. César Bracamonte agrees in that this is an
Eumops for the prominent ears and the robust body and adds that it may be flying during the day because it may have been driven away from its refuge, something common...
Regarding the tail Rubén comments that "when manouvering in flight the tail can be folded and it is not seen in a photo." For César "The tail is folded that is why it does not extend beyond conspicously."