Can native animals and plants be intrusive? They sure can! Back in 2015, we had an invasion of Barn Swallows in our Overlook structure. So much so, that we had to quarantine the structure and not allow access due to the dangers of bird guano, mites, and possible disease. That structure no longer exists, but the new pavilion may suffer the same fate – a conference of the birds – nesting, guano, feathers, and other debris.