TZ here; Would warmly recommend this video with Sophia Love reading Jack Sturgeon.
Patterns of behavior arise in bluebirds, spread throughout the bluebird population, and then disappear for ten years, only to appear again. (1) How is it possible?
Sophia Love reading Jack Sturgeon.
Bluebirds in England learn to pull off the caps on milk bottles and drink the cream. Then bluebirds in an adjacent village learn. Then all over Britain and even in Sweden, Denmark and a few others the birds were active.