o·ver·pop·u·late 
(ō′vər-pŏpyə-lāt′)
(ō′vər-pŏpyə-lāt′)v. o·ver·pop·u·lat·ed, o·ver·pop·u·lat·ing, o·ver·pop·u·lates
v.tr.
To fill (an area, for example) with excessive population to the detriment of the inhabitants, resources, or environment.
v.intr.
To breed to excess: wild animals that overpopulated and then starved.