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Yes, in some cases if your damper is left open, animals can come down your chimney. In these instances, it’s more likely that they have fallen in while looking for a safe spot rather than entered your house intentionally. Leaving your damper closed or installing a chimney cap can prevent animals from coming inside.

An owl's worst enemy in the wild is often other raptors and environmental factors. Among the avian threats, larger owls or other birds of prey can pose a danger, engaging in territorial disputes or competing for food resources. Terrestrial predators like foxes, raccoons, and larger mammals may target owl nests or young fledglings. Environmental factors like severe weather conditions, habitat loss, and food availability changes can also significantly impact owl populations.

The lifespan of a bird's nest depends on the species. The building process can take from two days to three weeks. Once built, the nesting period for baby birds can last from two to ten weeks before they leave the nest. While most young birds are ready in two to six weeks, some predatory species may need up to two and a half months. Some species nest four to five times per year, so a nest could remain in use for several months. For specific information about a particular nest's longevity, it is best to consult a wildlife professional.

Both spikes and loose nets can be installed over nest sites to prevent the bird from returning, but nets are not a humane option since birds and other wildlife can get tangled in them. 

Spikes are a humane alternative that deter nesting without harming the birds. In small areas, like vents, a very fine mesh net can be installed to prevent the bird from returning. These nets don't generally pose a risk to the birds.