Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to choose a leopard gecko [title] Look at the gecko's tail. [step] It should be plump and fat, preferably as wide or wider than the space between the gecko's shoulders. The tail should be somewhat rounded and not have a shriveled appearance.

Ending1: [title] The gecko should also have no signs of disease, and have clear eyes, mouth and nose. [title] If you take a look at the face, it should have no " goop " around or on the eyes, and no scratch, burn or bite marks should be seen, and the jaw should properly close. Ending2: The leopard gecko's tail should be mostly smooth, and the base should be shaped snug to the tail. [substeps] Unlike leopard geckos, geckos are nocturnal, so it is best to leave extra room for the leopard gecko to explore when it feels like it's safe to do so. Ending3: The base of the leopard gecko's tail should be slightly curved. [title] Pick a black gecko if you can't find any leopard geckos. Ending4: Instead, the gecko's tail should be thick, but not webbed or frayed. [substeps] Leopard geckos, whenever preparing their food, will hold it up to light, producing their most noticeable displays.

Answer format: ending1/ending2/ending3/ending4