Leaping Hatchling



Leaping Hatchling is a companion that follows you around, meaning it is a non-combat pet and will not aid you in battle.

Source
As of patch 3.3.0, the Leaping Hatchling is found within Takk's Nest, an infrequently spawned object in The Barrens. Reports are that Takk the Leaper and Takk's Nest are not on the same timer.

Pet Journal
This offspring of Takk the Leaper is incredibly agile and can maneuver through difficult environments with ease.