| Usually,
the higher you go, the lower the temperature. It takes a while
for spring to "climb" a mountain! A group of scientists
in a mountain lab wondered about robins that came there to breed.
They knew that in the early 1980s, the birds arrived around April
4th. But they thought the robins were showing up earlier. So they
gathered some data. What do you think they discovered?
It
takes time for spring to climb up mountains. For each 1,000 feet
of elevation, the temperature is about 3.5 degrees F lower. 
US Fish and Wildlife Service
|