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Climate and Environment

    • Pooping, splooting, spitting: How wild animals beat the heat

    A squirrel sploots in Washington, DC. (Celal Gunes/Anadolu Agency/Getty Images) A squirrel sploots in Washington, DC. (Celal Gunes/Anadolu Agency/Getty Images)
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    Hottest day, hottest week, hottest month, and – increasingly likely – hottest year; 2023 has garnered unwanted records as the climate crisis escalates.

    Animals, like humans, are greatly affected by the rising temperatures. Species that have evolved tactics to combat the heat are relying on those behaviours to try to keep cool.

    From peculiar methods like β€œsplooting,” to changing physiology altogether, here are four ways different creatures are trying to beat the heat.

    SPLOOTING

    You might never have heard of it but if you're a cat or dog owner, you've almost definitely seen a β€œsploot.”

    Also known as β€œfrogging” or β€œpancaking,” splooting is the flat-out, spread-eagle posture beloved by many four-legged animals and animal lovers alike.

    Yet splooting – which was added to the Collins Dictionary in 2021 – serves a purpose beyond comfort and cuteness. In scientific circles, it's known as β€œheat dumping.”

    The term shot to prominence in August 2022 after pictures of squirrels splayed out on their bellies in New York City sent the internet into a frenzy. Scientists offered a logical explanation.

    β€œThe squirrel is putting as much of their body surface as possible in contact with a cooler surface, frequently on concrete or pavement that's been in the shade,” biologist Charlotte Devitz told CNN.

    Splooting is a popular method of thermoregulation for squirrels, especially among larger species, as they do not lose much body heat through sweating, Devitz explained.

    β€œIt's quite possible there's a higher incidence of this type of behaviour in squirrels that are in urban areas, just because they're more in need of ways to cool down,” she said.

    β€œWith climate change, overall temperatures are rising. We're seeing more of these heat spikes, more drought. I think it's quite possible that this behaviour will be more and more prominent and more and more necessary for the squirrel.”

    SHAPESHIFTING

    Some warm-blooded animals are developing different body shapes to adapt to a hotter climate, scientific research has found.

    A noted that some animals are developing larger beaks, legs and ears to better regulate their body temperatures. One Australian parrot species showed an increase in beak size of up to 10% since 1871 – the biggest shift in appendage size seen in the review, with smaller increases recorded in shrews' tails and bats' wings.

    β€œIt means animals are evolving, but it does not necessarily mean that they are coping with climate change,” Sara Ryding, a researcher at Deakin University in Australia and one of the authors of the review, told CNN.

    β€œWe also don't know whether these shape-shifts actually aid in survival (and therefore are beneficial) or not. This phenomenon of shape-shifting shouldn't be seen as a positive, but rather it is alarming that climate change is pushing animals to evolve like this, under such a relatively short timeframe.”

    The study also noted that while climate warming was a β€œcompelling argument” as the driving force behind these changes, it was difficult to be certain given the multifaceted effects climate change has on the environment.

    SPITTING AND SNOTTING

    Two Australian animals put their bodily fluids to good use in the battle to beat the scorching temperatures of the outback.

    Red kangaroos, the largest species of marsupial, lick their forearms, covering a packed network of blood vessels and capillaries in spit. As the glistening coat of saliva evaporates, it lowers their body temperature.

    Meanwhile, echidnas, small quill-covered mammals also known as spiny anteaters – have been found to blow snot bubbles to help combat overheating, .

    Unable to sweat or pant, it was once thought that their primary defence from high temperatures was simply hiding from the sun.

    However, the report, which used thermal vision to monitor wild short-beaked echidnas, showed that they blow mucus bubbles that wet the tip of their snouts. When the moisture evaporates, it cools a large pool of blood located in a sinus at the beak's tip.

    Lead that understanding how echidnas keep cool could help predict how they might respond to climate change.

    POOPING

    Storks are one of a handful of birds known to excrete liquid onto their legs when they overheat. The liquid – which contains both feces and urine – evaporates, lowering body temperature in a process akin to sweating in humans.

    The method – known as β€œurohidrosis” – is more common in longer-legged birds such as storks, condors, and boobies, and requires regular access to drinking water, .

    Other birds, including pelicans and cormorants, use a technique known as β€œgular fluttering” – opening their mouths and rapidly vibrating their moist throat membranes to cause evaporation.

    The report noted that understanding how animals regulate heat could help to β€œimprove our capacity to make accurate predictions of climate change's impact on biodiversity,” and determine how vulnerable some species are to heat stress.

    Editor's note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex's Perpetual Planet initiative has partnered with CNN to drive awareness and education around key sustainability issues and to inspire positive action.

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