Male gorillas kill baby gorillas -— what makes anyone think a gorilla wouldn’t kill a child intruder into its territory?
Impact of Male Infanticide on the Social Structure of Mountain Gorillas
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3819382/
This is the “third rail” I have been thinking about, since it happened...and the one no one is likely to touch.
Male gorillas are not particularly maternal.