Female hoverflies beat males on long-distance migrations, research finds
Marmalade hoverflies leave northern Europe each autumn to escape the cold winter. A study, by the University of Exeter, ...
National Audubon Society14h
Where Have All The Birds Gone?
Q: The amount of effort that goes into a Christmas Bird Count varies quite a bit across years and count circles. How do you deal with this issue when you calculate abundance trends? How do you know ...