The crossword solutions for the term FISH, TO HERONS is PREY. Fish are a common PREY for herons, which are large wading birds that feed on small aquatic animals such as fish, frogs, and insects. Herons use their long beaks to catch their PREY, which they then swallow whole. Fish are an important part of the heron's diet, and they can often be seen standing in shallow water, waiting for a fish to swim by.