This short is about a tribe that hunt flying giant creatures that looks like a stingray, the tribe kill one creature and eat it, but some of the hunters after eat the flesh of the creature, turns into zombies and begins to walk until arriving a temple, in that place there is a line of hunters zombie who throw themselves to a pit in the temple, while they are falling, their body begins to turn into a cocoon, and when they reach the end of the pit they out like the flying creatures that hunt.

I remember that this short is in colour, I saw it in the 90’s but I doubt that the short was from that date.