Hello, I'm an expert in pest control and identification. I can help you with identifying various pests, including their droppings.

A mouse dropping is typically small, about 1/8 to 1/4 inch in length, and has a rodent-like shape, which is a bit pointy on the ends. They often resemble grains of rice or small, dark pellets. Mouse droppings are usually dark brown or black in color when they are fresh, but as they age, they can become more crumbly and lighter in color.

Here's the description in English, followed by the translation in Chinese:

English: A mouse dropping is typically small, about 1/8 to 1/4 inch in length, and has a rodent-like shape, which is a bit pointy on the ends. They often resemble grains of rice or small, dark pellets. Mouse droppings are usually dark brown or black in color when they are fresh, but as they age, they can become more crumbly and lighter in color.

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Rodent infestations can be the result of house mice, deer mice, roof rats, Norway rats, and even squirrels or raccoons. As mentioned above, mouse droppings are usually ? inch or less in length, and similar in size and shape to a grain of rice. ... Squirrel droppings are similar in shape, but a little larger and thicker.read more >>