producatori - grau, nuc, porumb, cais, visin, mei
consumatori primari - soarece, gaina, omida, albina
consumatori secundari - pisica, lup, stiuca
consumatori tertiari - uliu (frunza-omida-vrabie-uliu) si lup in delta dunarii (frumze-crap-stiuca-pelican-lup)
consumator cuaternari - acvila (frunza-omida-vrabie-pisica-acvila)
urs (frunze - broasca - barza - lup - urs )
reducatori (descompunatori ) - ciuperci, bacterii, larve de muste