Generally, large birds and seabirds live longer than small birds. Albatrosses live so long that it is hard to calculate their survival rates - they can live longer than the metal rings that identify them, and probably longer than most humans.
Food chain. Definition. A feeding hierarchy in which organisms in an ecosystem are grouped into trophic (nutritional) levels and are shown in a succession to represent the flow of food energy and the feeding relationships between them. Supplement.
food chain. The transfer of food energy from producers (green plants) to primary consumers (herbivores) to secondary consumers (carnivores). Dead organisms of all kinds are reduced to simpler chemicals by decomposers (bacteria and fungi), which make minerals available again for green plants. See also: chain.