Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to tell the difference between a cockatiel and a cockatoo [title] Look at size. [step] First, consider the size of the birds. Cockatiels are generally much smaller than cockatoos.

Ending1: Cockatoos do range in size, as they come in a variety of types, but can grow up to 26 inches tall. Cocktails, conversely, are usually only 13 to 14 inches tall. Ending2: Cockatoos are also very thin birds. Their exact ability to talk, listen and be heard is dependent upon the size of their eyes. Ending3: Most female cockatoos are around 5 feet tall, while male cockatoos are larger than that. If you are looking at a cockatiel, check out his size for the look he is attempting to convey. Ending4: The game requires that either the birds be thin or very tall to maintain their airspan. Cockatoos who are still small enough to stand on their feet should be wise to try and curb their eyesight while keeping them afloat.

Answer format: ending1/ending2/ending3/ending4