Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to tell if your bird has mites [title] Check around your bird's eyes and beak for any crusty looking area. [step] Mites affect your bird by burrowing into their skin, often in the area around their eyes and beak. This is known as an infestation of, or burrowing face mites.

Ending1: In the early stages of this infestation, the mites are barely visible and will not affect the overall condition of your bird. But you may notice crusty plaques in the corners of your bird's beak or on your bird's beak. Ending2: Mites also form if your bird is in an extremely cold environment, such as in an apartment building or near it's food source. [substeps] Mites often show up under the eyes, but do not actually burrow deep into the body. Ending3: To avoid dealing with mites, make sure you check around your bird's eyes and beak for signs of mites. [substeps] A yellowing nose and a cloudy eye may indicate mites. Ending4: This buildup of mites can create a greasy, slimy-looking discharge coming from your bird's mouth. [substeps] If your bird has mites, and its beak is crusty and stringy, it may have mites.

Answer format: ending1/ending2/ending3/ending4