机译:Insectivorous birds consume an estimated 400-500 million tons of prey annually
Univ Basel, Sect Conservat Biol, Dept Environm Sci, CH-4056 Basel, Switzerland;
Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA;
Univ Illinois, Dept Biol Sci, Chicago, IL 60607 USA;
Arthropods; Avifauna; Breeding season; Global impact; Insect pests; Predation;