How are filter fish and fluid feeders alike?

Filter fish and fluid feeders are alike in that both methods involve extracting nutrients from their environment rather than hunting or foraging for whole prey. Filter fish, such as certain species of bivalves and some fish, use specialized structures to sieve small particles from water, while fluid feeders, like mosquitoes and some birds, obtain nutrients by consuming liquids from their hosts or surrounding environment. Both strategies allow these organisms to efficiently gather sustenance while minimizing energy expenditure.