There are a variety of benefits to doing things in groups. Consider the last cookout you attended. Someone else bought the food. Someone else cooked and cleaned up. There was less risk of being eaten by a predator. Communal roosting makes sense too. Eating and roosting together makes sense for Great Egrets, Snowy Egrets and White Ibis.
More ears and eyes means predators are at a disadvantage during a sneak attack. While roosting, huddling can conserve warmth for those with the best spots in the roost. The downside is when you head out for breakfast in the morning everyone follows. The older and experienced birds tolerate social parasitism in exchange for safety in numbers. There is a pecking order and bigger birds can dominate others in the flock.
Finding food is also easier with many eyes looking. Once located, the buffet commences. Here a flock of Great White Egrets, Snowy Egrets and a few White Ibis have found a high concentration of fish and frog eggs to feast on.
Around the outskirts of the buffet are Little Blue Herons who are exhibiting commensalism. As the Egrets and Ibis stir things up, the Little Blue Herons feed on what the rest of the birds are not interested in. Essentially commensalism is when one species feeds among others and benefits without harming or benefiting the main species. In this case the Little Blue Heron is the guy that came to the party with the friend you invited. Little Blues are twice as successful when feeding commensally as opposed to individually.
May marked the end of the dry season in
which generally runs from December
through May 15th. As the wetlands begin to fill with water and prey species
re-colonize the marshes and swamps, many of the wading birds will rely less on
communal feeding and venture out to forage solo. After a long day of hunting,
it’s back to the communal roost for an evening of preening and sleep. Party on. Florida