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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.

Vinegar can keep some animals at bay, like deer, rabbits, foxes, and raccoons. Keep in mind that your household pets, like cats and dogs, also don’t like the smell of vinegar. You can soak rags in white vinegar and put them up around your garden beds to keep the pesky critters from eating your plants.

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.

This depends on if their needs are being met. They'll likely return night after night if they have access to food, water, and adequate shelter. If this changes, they’ll look for another roosting spot. This is why bright lights and other dissuading factors often work when removing bats from a property.