150 
THE MAMMALS OF EGYPT. 
stration. In all likelihood, the young at birth seize these teats for a two-fold purpose, 
viz.: as a source of nourishment lying close at hand, and as a means of assisting them 
to hang on to their mothers during flight. As they gain strength they find their way 
forwards to the pectoral teats ; but as the young of all bats are equally helpless at 
birth the restriction of pubic teats to certain families of bats is an enigma for the 
present. 
