Which pest is known for leaving pointed black droppings about 3/16 - 1/2 inch long?

The correct choice is the house mouse, which is characterized by leaving pointed black droppings that measure about 3/16 to 1/2 inch in length. These droppings can often be seen in areas where the house mouse frequents, including near food sources, in hidden corners, or along walls. The shape and size of the droppings are key identifiers, as they help distinguish the house mouse from other pests.

For instance, the droppings of the Norway rat are generally larger and more blunt at the ends, typically measuring about 1/2 inch or longer. Cockroach droppings, on the other hand, are usually more oval-shaped and can vary in size but lack the pointed appearance that is indicative of mouse droppings. Lastly, the star-nosed mole is not known for leaving droppings in the same context as the other pests and tends to dwell underground, making this choice irrelevant for the situation posed by the question. Understanding these distinctions is vital for effective pest management and identification.