Are house sparrows considered good quarry for kestrels?

House sparrows are considered good quarry for kestrels because they are a common and abundant bird species that provide a suitable size and availability for hunting. Kestrels, being small falcons, often prey on birds that are roughly similar in size to house sparrows. These sparrows are frequently found in various habitats, making them accessible to kestrels hunting in urban or rural areas. Their abundance ensures that kestrels have ample opportunities to successfully capture them as a food source.

The other options presented do not accurately depict the nature of the relationship between kestrels and house sparrows. While house sparrows may be small in size, they fall within the hunting range of kestrels. Seasonal variations, such as hunting preferences only in winter, do not apply here, as kestrels can hunt house sparrows at any time when they are available. Lastly, house sparrows are not protected under the Migratory Bird Treaty Act, meaning they can be hunted by falconers and are therefore not restricted as quarry for kestrels.