Домик для воробьев - диаметр летка

What diameter should a tree sparrow's entrance be? #BirdHouse #Vishnevsky'sAdvice #Sparrow Video Report from Denisovo. Double sparrow house. I used 15 cm wide boards. The overall shape of the structure is a horizontal parallelepiped with two identical chambers. The parallelepiped is 30 cm long and 15 cm wide on the inside. Each inner chamber is 15 x 13 (14) cm in area and 12 cm high. The lid is hinged on top. The entrances to the chambers are round. The diameter of the left entrance is 3 cm, the right one is 3.5 cm. I hung the sparrow house in March 2016. It hung there all season without any birds moving in. In 2017, a tree sparrow occupied the right chamber. THANK YOU FOR YOUR ATTENTION! If you found something good, share it. If you found something interesting, tell your friends about it. Thumbs up if you found the time spent watching useful. Thumbs down if I've upset you in any way. ================================= COMMENTS Don't forget to add to and/or refute the video, including my ideas, methods, and conclusions. For only those who do nothing make no mistakes. It's best to ask questions directly under the video on YouTube so others can see the answers. My secondary channel features documentary videos without commentary or editing.    / @docnat   If you're interested in photographs of birds, their nests and eggs, and additional information on wildlife photography, I recommend my books and website: http://www.fotoparus.com/ Contacts: http://www.fotoparus.com/contacts.shtml ================================== Follow me on social media. I usually duplicate the trailers for most videos there as well: VK https://vk.com/id1056558 FB   / fotoparus   OK https://ok.ru/fotoparus Instagram   / fotoparus   Telegram https://t.me/fotoparuscom ================================ Best wishes to all!