1 Answer
House (English) sparrows and European starlings are non-native species introduced from Europe and their aggressive seizure of cavity nest sites is the main reason for the rarity of bluebirds today. Starlings nest in many of the natural nest sites but can be excluded from nest boxes by only using 1 1/2 or 1 9/16 inch entrance holes. House sparrows can readily enter bluebird nest boxes and frequently kill bluebirds, destroy their eggs, or drive them from their nests. At no time should they be allowed to successfully nest in bluebird boxes. Doing so will increase the house sparrow population and further reduce the number of the bluebirds.
from: http://www.nabluebirdsociety.org/monitoring.htm
Yvonne57
from: http://www.nabluebirdsociety.org/monitoring.htm
13 years ago. Rating: 2 | |

Ann - thanks for the TU
Top contributors in Other - Environment category
Unanswered Questions
Effective Sports Betting Tips for Players
Answers: 0
Views: 4
Rating: 0
https://trafficseotop.com/
Answers: 0
Views: 4
Rating: 0
Vuabet Vip Trang Chủ vuabet.vip Giải Trí
Answers: 0
Views: 4
Rating: 0
88GO – Nhà Cái Cá Cược Trực Tuyến Uy Tín Số #1 Châu Á [2025]
Answers: 0
Views: 7
Rating: 0
FIVE88 - Link Truy Cap Trang Chu Five88 Moi Nhat 2025
Answers: 0
Views: 3
Rating: 0
Trải nghiệm thế giới bắn cá đổi thưởng hấp dẫn
Answers: 0
Views: 9
Rating: 0
Mien Trach Nhiem 69vn
Answers: 0
Views: 8
Rating: 0
zowin
> More questions...
Answers: 0
Views: 9
Rating: 0