What is an anfiben?

An "anfiben" appears to be a misspelling or a miscommunication, as it doesn't correspond to a recognized term in English or any scientific context. If you meant "amphibian," that refers to a class of animals that includes frogs, toads, salamanders, and newts, which typically live both on land and in water during different life stages. Amphibians are known for their moist skin and life cycles that often include a larval stage in water. Please clarify if you meant something else!