Wolves are forced to work harder for food as winters get warmer. New research suggests that gray wolves not only change their roaming patterns when the climate shifts, but also alter their eating habits. In warmer periods, wolves seem to consume the harder parts of carcasses, including bones, as if they're squeezing every last bit of nutrition out of a meal when conditions make hunting and feeding more challenging. This study, led by the University of Bristol and the Natural History Museum, compared wolf teeth from two ancient warm intervals and modern wolves in Poland, where winters are getting milder and snow cover is shrinking. The goal was to determine if warming climates leave a clear signature in wolf diets and if that signature is already evident today. Using a technique called Dental Microwear Texture Analysis (DMTA), the team found that wolves in warmer climates consumed harder foods, including bones. This behavior, known as durophagy, suggests that wolves were working harder to extract nutrition during warmer climate periods, scavenging more extensively or consuming parts of prey they would normally avoid. The findings have significant implications for wolf conservation across Europe and beyond. While wolves are famously adaptable and have rebounded in many places, this research shows that warming temperatures should be considered a critical factor in conservation planning. As winters get warmer and snow cover declines, prey animals can move more easily, making hunting harder for wolves. This may force wolves to spend more energy to get the same payoff and, when they do get a kill, they may need to use it more thoroughly, which is supported by the tooth-wear evidence of heavier bone consumption. In a warming world, the 'wildest' places may not automatically be the easiest places for wolves to thrive, especially if prey becomes harder to catch without the advantage of snow. The study also highlights the importance of fossil collections and modern conservation efforts. By using museum fossils as a climate and ecology archive, the research emphasizes the need to leverage fossil specimens in museum collections to their full potential in studies focused on conservation palaeobiology. This emerging field seeks to apply knowledge from the fossil record to modern issues of nature conservation and restoration. In conclusion, while wolves are not doomed, climate change should be treated as a real pressure on large carnivores, even those considered tough and flexible. Long-term conservation planning must include climate, not just habitat and human conflict, as the warning signs may not always be dramatic population crashes but can be microscopic scratches on a molar, indicating that life is getting harder and wolves are chewing the bones to prove it.
