Two chimpanzees have been killed in Kibaale National Park.
Encroachers speared a female chimpanzee to death on Tuesday and seriously injured her baby, which died two days later.
The Uganda Wildlife Authority acting executive director, Damian akankwasa, said the encroachers were reportedly trying to smuggle the baby chimpanzee.
He said a boy, who was carrying the injured baby chimp, was arrested.
The boy claimed he was hired by some men who reportedly escaped when he was netted.
Akankwasa said this is a big loss, adding that the culprits would be arrested.
Meanwhile, security has been beefed up in national parks with the acquisition of marine equipment.
The wildlife authority received two outboard engines, 24 backpacks, six geographical positioning systems, tents and a sh8.8m cheque from a donor, Transboundary Collaboration Project.
Akankwasa believes the donation will boost their patrols.