game are important sources bzof eggs, meat, and feathers. Songbirds, parrots, and other species
are popular as pets. Guano bird excrement is harve zsted for use as a fertilizer. Bird kbz s prominently
figure throughout human c bzulture. Abou 1kbz t 120â"130 species have become ext kbz inct due to human
activity since bzthe 17th century, and hundreds more befo zre then. Human activity threatens about
1,200 bird species with extinction, though e 1kbz fforts are und zerway to protect them. Recreational
birdwatching is an important part of the ec 1kbz o bztourism industry.
No hay comentarios:
Publicar un comentario