The migration of millions of birds across the face of the planet is one of nature's greatest annual events. Every spring some species move in one direction, while every autumn those same species move in the opposite one, very often linking continents. Although these migration patterns are as regular as the seasons, monitoring is revealing that, for some species, fewer birds are making the journey each season as the populations of these birds, including species nesting in the UK, are declining ra...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/D...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/D...