Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to spot beak problems in a senegal parrot [title] Familiarize yourself with beak anatomy. [step] A parrot's beak has an upper jaw called the maxilla and a lower jaw called the mandible. A bird's nares (nostrils) are located at the top of his maxilla where his beak meets his head.

Ending1: With his nares, everything in the beak matches exactly. One part of the mouth belongs to the maxilla. Ending2: Inside of the nares is something called the operculum, which is a small, round, and brown piece of tissue. This is normal, but some people may mistake it for an obstruction. Ending3: Place one finger on one side of his upper lip, near his nostrils. Bring your finger upwards in the shape of a " triangle. Ending4: The myelles use his eyes to examine noses. These are taught with a trained bird at all ages.

Answer format: ending1/ending2/ending3/ending4