Which statement is true regarding bed bugs?

The statement about bed bugs being about the size and shape of an apple seed is accurate. Adult bed bugs typically measure around 4 to 5 millimeters in length and have a flattened oval shape, which does resemble an apple seed both in appearance and size. This characteristic is important for identification, as recognizing the size and shape can aid in detecting infestations early.

The other statements do not reflect the true nature of bed bugs. While bites can sometimes appear in groups or clusters, it's not a definitive pattern, as bed bug bites can vary widely among individuals. They are hematophagous pests that prefer human blood, and though they can bite various other hosts, bats are not their primary choice compared to humans. Regarding grooming, bed bugs do not ingest dust pesticides effectively, as their grooming habits are more focused on hygiene rather than pesticide ingestion. Understanding these distinctions is crucial for addressing bed bug infestations effectively.