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.
The concept of a food chain is an abstraction or generalization. Ecosystems are more complicated than a single food chain would indicate. Most aquatic ecosystems contain many more species than those in a single food chain, and all of these species interact and are interdependent.