Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
cohabitation complex onesided symbiosis synoikia rook built nest falcon establish sparrow rooks nesting bird protection symbiotic relationship coexistence spanish passer hispaniolensis redfooted nests falcons hosts sparrows build loose animal bouse community english environment feather breeding birds german gutter human parasite nature domesticus sponger behavior behaviour species defender colony parasitism social relations relationships rapport mutual relation nidification