Due to having limited body hair, goosebumps don’t work as well as they do on squirrels or birds. Surprisingly though, goosebumps are the body’s way of trying to stay warm. There is a tiny muscle, the arrector pili, that contracts at each hair follicle to pull the hair upright.
Thanks, Acid Cow
Captured this on the island of Tenerife in the Canary Islands. It took about 2.5 hours to film this timelapse.