Merging (animals) – The ability to merge two or more animals. You can merge different species into one entity.
The Swarm (Marvel) went the hive mind route and is a swarm of bees merged with a human intelligence (Champions V1 #15).
Ancasta merges birds to form a single monster in Thulsa Doom #4 (Dynamite).
G-Dog – Astro City #48 (Vertigo)
Angel Catbird V1 (Dark Horse)