Trabancos (river) Castile and León (with more than 200 mating pairs). It is also the winter season nesting ground of more than 1,500 red kites ("Milvus milvus"). There are also numerous birds of prey; the most abundant are Montagu's harriers ("Circus pygargus", 50 mating pairs) and lesser kestrels ("Falco naumanni"; almost 150 mating pairs), but there are also hawks, goshawks, falcons, owls, and others. The region is also host to numerous gamebirds, including the red-legged partridge ("Alectoris rufa"). Despite their importance, the population of little bustard ("Tetrax tetrax") in the region appear to be diminishing. Although not all the species protected in
Ben 10: Secret of the Omnitrix signal, picks up Sixsix, one of Tetrax's rivals, and starts tracking Ben. While attempting to reach Azmuth, they are attacked by Vilgax. Ben is ultimately successful in repelling the attack, though Gluto is supposedly killed in the conflict while protecting Gwen, who blames Ben. Tetrax's ship crashes on Azmuth's homeworld. As they enter his mountain fortress, they are attacked by a group of Florauna (Wildvine's species) which capture Gwen. Ben is depressed, and blames himself. As Ben reluctantly proceeds with Tetrax and Myaxx down towards Azmuth's lair, Tetrax empathizes with Ben, revealing his origins of how working for Vilgax cost