Image taken from page 149 of 'La Route du Tchad. Du Loango au Chari. Ouvrage illustré, etc'
Image taken from:

Title: "La Route du Tchad. Du Loango au Chari. Ouvrage illustré, etc"
Author: Jean DYBOWSKI.
Shelfmark: "British Library HMNTS 10097.i.36."
Page: 149
Place of Publishing: Paris
Date of Publishing: 1893
Source: https://www.flickr.com/photos/britishlibrary/11302741756/

The hammer-headed bat (Hypsignathus monstrosus), also known as the big-lipped bat, is a megabat widely distributed in equatorial Africa. The hammer-headed bat is a member of the family Pteropodidae. Hammer-headed bats are frugivores. Figs make up much of their diet, but they may also include mangos, bananas and guavas.