A long term record of alpine chamois weights from the Alps shows that body mass has been declining since 1979.
Using mass of over 10,000 carcasses from hunters, the authors show that the weights of juvenile chamois have been declining over the past few decades. Although some of the decline is due to increasing population density (stricter hunting laws), it appears that high temperatures also have been directly causing declines in mass.
The authors propose greater thermoregulatory demands as contributing to the declines, but the authors were unable to determine whether forage quality had declined.
Mason et al. Frontiers in Zoology 2014, 11:69