We have two areas in our front yard where ant mounds have surfaced over the years. I've observed on several occasions when a crow stands on a mound and waits for the ants to crawl up on his feet or legs and eats them off of himself. I guess it's easier to catch the ants when they are biting you than chasing them around.
My little flock of crows also knows what time to expect their breakfast. Whenever I've been late, they come to the closest pine tree next to my home and either call for me or complain.