This is The Origin of Creatures, a bizarre 10-minute film by Floris Kaayk about a post-apocalyptic future where human beings have devolved into swarms of appendages. Here's the synopsis and making-of this charmingly twisted short flick:

The Origin of Creatures is based on one of the most well-known tales about collaboration, the Tower of Babel. This tale is transformed and twisted and is set in an imaginary future, after the world is hit by a catastrophe. Among the remains of a devastated city lives that what is left of humanity. Human bodies are divided into separated parts of the body and are fused to special beings. Together, these creatures form a colony, they can only survive when collaborating. In the rubble of destroyed buildings they are trying to build a nest as large and as high as possible, so that the colony's queen gets enough sunlight to reproduce, but due to miscommunication this mission is doomed to fail.

[Via Short of the Week]