I drew this for 's project Serina (a terraformed world where the only tetrapod present is the domestic canary) They were originally a fanmade non-canon concept (by me) of a jellyfish-eating member of a group of seagoing canaries known as bloons , but he said they were in-viable since bloons stored their eggs in their throats, and these fellows have spiky throats and mouths, which are bad to have when you basically give birth through the mouth. In my defence, I thought bloons were part of a group of canaries that stored the eggs in a pouch behind the cloacae. Looked like this before though.They were later given life in canon as part of a much later group of marine canaries known as burdles , which are descended from the maritime muck , a marine iguana-like animal. Burdles are basically exactly what you'd expect, and this species here (the jelly-eaters), are the bird equivalent to a certain oceanic jellyfish-eating reptile in real life (there are hundreds, I know). The one on the right is hunting conventional jellyfish, while the one on the left is feeding on a photosynthetic colonial jellyfish descendant known as chainjellies.