Why? Seriously... WHY?
The African animal preserves are like our National Parks. There are many rangers, mostly black Africans with skills and training, who interact with the animal population from whatever safe distance, and who will intervene in some circumstances with veterinary care, rescue from falls into holes or mudslides, entanglement in traps, etc. The keepers become very fond of the animals under their supervision. The funeral will be for their feelings.
I don't know about lions, but elephants are known for expressing grief and holding "funeral" observances of their own when one from their herd dies; and sometimes for paying condolence calls near the home or workplace of a human caregiver whose death they can sense, even from a distance.