Fem schimpanser rymde från Furuviksparken i Gävle. Fyra sköts (2022-12-14)

Det är väldigt svårt att säkra ett område där de kan röra sig fritt och komma ut till allmänheten.

But as early as 1974, researchers in Gombe National Park in Tanzania had been startled to observe chimpanzee males organizing gangs of a half-dozen or so members and launching lethal raids into the territory of neighboring chimps. These were clearly not food-gathering expeditions. The chimps did not stop to eat, and they did not make any of their normal calls and shouts. Instead, they crept silently into the territory of a neighboring group and hid until they saw a lone chimp. Screaming with excitement, they would ambush the victim, hold him immobile and beat him to death, sometimes twisting the victim's leg until the muscles ripped, or tearing off flaps of skin while he was still alive. In one well-documented case in Tanzania, a group of male chimpanzees used such ambushes to eliminate a whole band of neighbors.

Further research found that such violence was not limited to chimpanzees. Male gorillas, for example, were observed ripping infants out of their mothers' arms and smashing them to the ground in often-successful attempts to entice the mothers to mate with them. One theory is that the male gorillas do this to demonstrate their strength and to show how valuable they would be as protectors.

The battle of the sexes is supercharged in the chimpanzee world. Males charge at females, rip out their hair and kick, slap or beat them. Males often kill the babies of rivals to increase the availability of females to mate again.
"Male chimpanzees can be really horrible to females," Gilby told Live Science.