"Colony of Birchmen" is a single by American heavy metal band Mastodon.

The song features backing vocals from Josh Homme, lead singer of the alternative rock band Queens of the Stone Age and former guitarist of Kyuss.

[1] It was also nominated for a Grammy Award for Best Metal Performance, but lost to Slayer's "Eyes of the Insane".

Drummer Brann Dailor has said that The Lamb Lies Down on Broadway, on which "Slippermen" appears, is his all-time favorite album.

A music video was created for the song which features the band performing in a cavern, Ruby Falls, while strange phenomena occur above on the surface in a forest along with people that are associated with the events.