Using mixed-species bird flocks as an example. we model the payoffs for two types of species from participating in multi-species animal groups. Salliers feed on mobile prey. are good sentinels and do not affect prey capture rates of gleaners; gleaners feed on prey on substrates and can enhance the prey capture rate of salliers by flushing prey. https://shopredoners.shop/product-category/the-slacker-jean/