Final answer:
Brown, oval-shaped casings often indicate cockroach activity, as these are the egg casings left behind by cockroaches.
Step-by-step explanation:
Brown, oval-shaped casings are typically a sign of cockroach activity. Cockroaches are known to leave behind egg casings, which are brown and oval, as they reproduce. These casings, known as oothecae, contain multiple embryos and are indicative of a cockroach infestation. This observation could help in identifying and addressing pest control issues involving cockroaches.