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
Edwardsiella tarda along with maintaining suitable sanitation of water. Other stress factors include drastic changes in temperature, pH, and dissolved oxygen levels in the water. In order to manage properly for edwardsiellosis water must be checked constantly in order to keep fish stocks completely free of pathogens. Some of the most recent research done on "Edwardsiella tarda" was performed by Griffin et al. (2013) to assess what the literature refers to as "the intra-specific variability of "E. tarda" isolates from 4 different fish species in the eastern United States." These intra-specific variations that they were looking for occur in other parts of