In the city of Portland that in the State of Oregon, in the northwest of the USA, there is a school with not used boiler room with a high pipe long ago. She was chosen under гнездовья by martins. To video – the pack of martins comes back from feeding, to nests in a pipe. Locals are going to look at it, as at an attraction.
Sometimes birds of prey use it. They arrive on a pipe in advance and wait the coming-back pack of martins there.