Illustration Parus major (IMAGE)
Caption
Free-living great tits show large differences in how strongly their blood hormone levels vary with environmental temperatures. These differences could make it easier for bird populations to adjust to changes in environmental conditions, such as temperature extremes.
Credit
Max Planck Institute for Biological Intelligence (i.f.) / Julia Kuhl
Usage Restrictions
Use of images is limited to editorial coverage of scientific topics relating to the activities of the Max Planck Society. Any kind of commercial use (including, in particular, the exploitation of images by means of sale or incorporation in image databases or image catalogues) as well as any promotional use/use for merchandise purposes, disclosure to third parties or granting of related rights to third parties is expressly not permitted.
License
Original content