Have you been observing the birds?
"The northward and inland movement of North American birds, confirmed by thousands of citizen-observations, has provided new and powerful evidence that climate change is having a serious impact on natural systems, according to a new report by Audubon (BirdLife in the USA)."
http://www.sciencedaily.com/...
Or the bees?
"According to his honeybees, big changes are underway in Maryland forests. The most important event in the life of flowering plants and their pollinators—flowering itself—is happening much earlier in the year than it used to."
http://earthobservatory.nasa.gov/...
How about the butterflies?
In recent years this species [of butterfly] has seemingly reacted to global warming by expanding its range from northern california to central Washington State and Idaho. More recently still, it has jumped the Sierra and invaded the western great Basin, becoming established in Sierra Valley, Carson Valley and near Verdi, NV. It also has been very responsive to spring temperatures, emerging nearly a month earlier than it did near Sacramento 30 years ago.
http://butterfly.ucdavis.edu/...
Or the trees?
Much of the U. S. has been warmer in recent years, and that affects which trees are right for planting. The Arbor Day Foundation has recently completed an extensive updating of U.S. Hardiness Zones based upon data from 5,000 National Climatic Data Center cooperative stations across the continental United States.
http://www.arborday.org/...
Would you believe a marmot?
"Marmots are now emerging thirty-eight days earlier than they did twenty-three years ago. We believe that this is in response to the warming in temperature. Because the temperatures in April have been warming up, they seem to be confused, and theyre now staying out in April earlier and earlier, even though there is still as much as five or six feet of snow on the ground."
http://www.pulseplanet.com/...
Or a mouse?
"Chipmunks, mice and squirrels are heading for the hills, perhaps chased to higher elevations by a changing climate, scientists report. Since the early 1900s, small mammals in California have shifted their ranges dramatically, mostly to higher elevations."
http://www.livescience.com/...
Or a moose?
"Hot summers are hard on moose," said Vucetich. Hot weather causes moose to rest more and forage less, he explained, and summer foraging is how moose prepare to survive the long, bitter winters....In 2000, there were 1,100 moose on the 210 square mile island. Now there are fewer than 400."
http://www.sciencedaily.com/...
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Okay. I haven't found a link between flea behavior and climate change. But if you follow the link on moose, you can note that part of the moose problem is an increase in ticks.
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Updates from the Comments
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In Patagonia: A Flight of Penguins, A School of Fish
Note: Unlike the links above, this is strange behavior but not yet strongly linked to global warming by scientists. But definitely worthy of a good "hmmmm...."
http://www.patagoniatimes.cl/...
http://www.patagoniatimes.cl/...
White Bark Pine Trees flee Pine Beetles and Tree Rust
Warming climates are expanding the geographic range of mountain pine beetle (Dendroctonous ponderosae) and creating more suitable habitat for beetle populations at higher elevations. This means that whitebark pine (Pinus albicaulis), a keystone species of high-elevation ecosystems in western North America, may be more vulnerable to beetle outbreaks than ever before. Whitebark pine is already in peril due to an introduced pathogen, and mountain pine beetle outbreaks will likely exacerbate its decline
http://eco.confex.com/...