Name a behavior that can indicate a feral cat population issue.

Frequent sightings of cats scavenging for food is a strong indicator of a feral cat population issue. When cats are often seen searching for food, it suggests that they may not have a steady source of nourishment, which is common in feral populations that rely on scavenging instead of relationship-based feeding from humans. This behavior can indicate an imbalance where the local environment is unable to sustain a population of cats properly, leading to overpopulation and issues such as increased competition for food, which can cause stress and spread of disease among the animals.

Other behaviors mentioned may not directly signify a feral cat problem; for instance, frequent sightings of animals in urban areas could relate to various wildlife, and increased dog barking at night generally pertains to the dogs rather than a specific cat population issue. Having too many pets in one household relates more to domestic pet management rather than a feral cat concern. Thus, the specific behavior of scavenging demonstrates the challenges faced by unowned and unmanaged cat populations in urban settings.