question: The Gastric-brooding frog is an extinct species that is famous for this unique way of incubating its eggs.
choices: The mother keeps the eggs inside her mouth until they hatch. The female keeps the fertilized eggs in pouches along her abdomen. The female keeps the eggs between her rear legs until they hatch. The mother swallows the eggs and incubates them inside her stomach.
answer: The mother swallows the eggs and incubates them inside her stomach.