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.
A food chain differs from a food web, because the complex network of different animals ' feeding relations are aggregated and the chain only follows a direct, linear pathway of one animal at a time. A common metric used to quantify food web trophic structure is food chain length.In its simplest form, the length of a chain is the number of links between a trophic consumer and the base of the web and the mean chain length of an entire web is the arithmetic average of the lengths of all chains in a food web.his food web of waterbirds from Chesapeake Bay is a network of food chains. Food chains are directional paths of trophic energy or, equivalently, sequences of links that start with basal species, such as producers or fine organic matter, and end with consumer organisms.