Footage from the BBC's new nature series "Parenthood" shows African social spiders committing matricide and cannibalizing their elderly relatives. Even Sir David Attenborough was horrified.

The spiders in question are Stegodyphus dumicola aka African social spiders.

I couldn’t find a link to the video in the article itself so here it is. Discretion is advised - it is fascinating and horrifying at the same time.