How is it possible for a seagull to eat a starfish? A Gull tries swallowing a starfish whole.

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It is possible for seagulls to eat a starfish and they do! Seagulls cannot separate out the meat from the bones before eating (like humans), nor do they have teeth to grind the bones up (like dogs) so everything gets swallowed whole. What happens to the indigestible bits? Several organs make up the bird's digestive tract. From the bill, food moves down a tube called the esophagus and into the Crop, which stores excess food so the bird can digest it slowly. The food then moves to the proventriculus, which is the first part of the stomach, where it is softened by gastric acid, mucus, and other digestive juices. The second part of the stomach, the gizzard, grinds the food into smaller pieces, often with the aid of grit such as sand or small stones the bird has swallowed earlier. If the food is particularly tough, it may move between the proventriculus and the gizzard several times for more efficient digestion. Once the food is sufficiently broken down, it moves into the small intestine, where the liver and pancreas help with absorbing nutrients. Next is the large intestine, which is very short for most birds. Where the small and large intestines join are the ceca, two pouches that help absorb any remaining water from the food and finish the digestive process.
After digestion, any remaining material, both liquid and solid, passes through the cloaca to be expelled from the bird's body. As is the case of most birds it only have one orifice where waste is expelled, this opening is also used for breeding and egg laying.
Also some Coast Guard training seen with a Helicopter and Cutter