The gallbladder is part of the biliary system (with the liver and the bile ducts) and has the primary job of storing bile. Humans can live without a gallbladder, the removal of the organ is called a cholecystectomy. Some animals don’t even have a gallbladder to begin with; animals that graze or eat constantly, like the horse, do not have a gallbladder. Humans eat few, larger meals, and require the bile in the gallbladder for a quick burst of digestive juices.
To find the gallbladder in the frog, lift the liver and look for a green colored pouch. Bile from the gallbladder is delivered to the duodenum of the small intestine via the bile duct.