https://www.vice.com/en_us/article/wx59p4/climate-change-is-forcing-animals-to-quickly-shape-shift-study-suggests

Climate change is causing animals around the world to “shape-shift” in order to better survive rising global temperatures caused by human consumption of fossil fuels, reports a new study.

Scientists have been monitoring the impact of climate change on wildlife for many decades, and have established that hotter temperatures will cause some species to shrink, lose fertility, and in some cases, die out completely. Past research has also established that animals in warmer climates tend to evolve larger appendages associated with dissipating body heat, a phenomenon known as Allen’s rule.