The doubletongue split from its ancestor the tunnel tasertongue and left the tunnel life and moved to the surface, living in the Slarti swamp area. Their legs have grown in comparison to their body and they have adapted a new, slimmer form for better movement. Their coloration slightly changed to fit the pale swamp landscape as well. The main physical change they went through though is in their tongues: instead of a single tongue every doubletongue grows another smaller tongue from beneath the major one. This tongue grows as time goes by, and is mainly used to graze on the swamp flora. As it gets to the size of the major tongue it starts growing its own little tongue. Finally when the major tongue falls off due to overuse, the doubletongue will still have the small and big tongue formation needed for its diet. The tongues fall off due to the powerful electric shock that still goes through them when they are used for hunting, and these shocks kill millions of cells every time. They also evolved sexual dimorphism; the females have a crest shape identical to the ones their ancestors once had while the males have many different spiky shapes of crests which are used to impress the females. They also often impale small shrooms or prey on them to impress the female as well. Their graspers in the end of each tongue has also changed and are now shaped as a joint glove, resembling a baseball glove.
They are generalist omnivores that feed on almost anything they can catch in the swamps. Their main food source which they hunt using their electric tongues are the dartirs, though they also feed on different flora. They even graze swamp beans in times of great hunger. They live alone and only meet for mating while the mothers take care of the young for their first month after being born. When two doubletongues meet the first thing they do is clean each other of purplerot, building their relations that way. The individuals with more purplerot on them are treated as inferior for they have to be cleaned for longer and therefore will gain less territory. The doubletongues seem to honor this unspoken agreement and hierarchy of purplerot and territory sharing method as individuals that are weaker and cannot catch their own preys will usually graze more for flora and get more purplerot. Females are also less attracted to these doubletongues. All doubletongue shed their major tongue once every 4–5 months and live for about 7 years on average which means each individual looses about 20 tongues in a lifetime.