Too wet to nest?
Data gathered by nest recorders helps us understand why some nests are successful and others are not. Recent BTO research has developed a method to analyse nest record data more effectively, and revealed some intriguing differences in the effect of rainfall on Blackbird nest success.
Why are Willow Warblers decreasing in the south, but not the north?
New research involving the BTO suggests that Willow Warbler population declines in southern Britain might be reversed by improving productivity there.
GPS tracks and cutting edge stats shed new light on seabird flight heights
Cuckoo declines linked to different migration routes to Africa
When the BTO began ground-breaking Cuckoo tracking research in 2011, we had very little idea where these birds spent the winter or how they got there. Our latest research not only reveals this information, but also shows that Cuckoos’ use of autumn migration routes helps explain population declines.
Causes and consequences of spatial variation in Willow Warbler sex ratios
New BTO research shows a recent imbalance in Willow Warbler sex ratios, with 60% of adult birds being male. Such a skewed ratio has implications for the conservation of this migrant species.