Fish and birds aren’t the only ones who feed on herring balls. Humpbacks often do what is called a lunge feed where they come up from underneath the herring ball with their mouth open and try to consume as many fish as possible. Often when we are out whale watching you will see gulls feeding on a herring ball. When the birds lift off the water it usually means one of two things. Either the fish have dispersed or there is a whale coming up for a snack.