You might assume polar bears drink water like other animals, but honestly, they barely do. Most of the time, polar bears get their water from eating fatty prey, and sometimes they’ll lick snow or drink from melt ponds on the sea ice.
Their high-fat diet and unique body chemistry let them create “metabolic water” inside their bodies. Snow and seasonal melt ponds help fill in the gaps.
The harsh Arctic shapes every move they make, from hunting seals to saving water in the freezing air.
Let’s dig into how these strategies actually work, and why melting ice and snow make water harder to find for polar bears.
How Polar Bears Meet Their Water Needs
Polar bears get water in a few specific ways. They make water inside their bodies, eat seal tissues packed with water, lick melt ponds or snow, and for cubs, drink mother’s milk.
Metabolic Water: Making Water from Fat
When you picture a thirsty polar bear, remember they also produce water inside their bodies. Burning fat in their cells creates metabolic water.
This process matters because Arctic sea water is salty and undrinkable. Polar bears depend on fat-rich diets, so their metabolism creates a good amount of water for every gram of fat burned.
That’s a lifesaver for adult bears stuck on sea ice when there’s no fresh water around. Metabolic water doesn’t always cover all their needs, especially during fasting or when they’re really active, but it does cut down on how often they need to find actual liquid water.
Role of Diet: Seals, Blubber, and Carnivore Adaptations
If you look at what polar bears eat, you’ll see where most of their water comes from. Seals offer both muscle (about 70% water) and blubber (less water, but tons of energy).
Bears usually go for blubber for the calories and eat muscle when they can get it. Eating seal tissues gives them water straight from the food, plus energy to make more metabolic water.
As carnivores, polar bears have digestive systems built for high-fat, high-protein meals. This lets them stay hydrated much longer than if they ate lean prey or plants—which, let’s face it, barely exist in the Arctic.
Drinking Meltwater and Eating Snow
In summer, you might spot polar bears slurping up fresh meltwater. Melt ponds on the sea ice and freshwater pools on land give them something to drink when the ice melts.
These sources matter most during warmer months or near the coast. Bears will eat snow too, but melting snow inside their bodies takes energy.
Usually, they only eat small amounts of snow to cool off or when there’s no liquid water around. Snow works as a short-term fix, but meltwater ponds hydrate them with less effort.
Mother’s Milk and Polar Bear Cubs
For cubs, it’s all about mother’s milk. Young bears get nearly all their water from milk, which is super high in fat and gives them both energy and hydration.
Cubs nurse for around 2 to 2.5 years, relying on milk until they can start hunting seals themselves. Even if the mother can’t find fresh water, her milk keeps the cubs hydrated.
Once cubs start eating seal meat and blubber, they gradually switch to the adult way—getting water from food, metabolic water, and sometimes meltwater or snow.
Survival Challenges and Changing Water Sources
Shrinking sea ice paints a tough picture for polar bears. Less ice means fewer hunting spots and more reliance on different water sources.
These changes shift how bears get water from food, snow, and their environment.
Effects of Climate Change on Water Availability
As sea ice disappears, polar bears lose access to seals—their main high-fat, water-rich prey. Arctic warming shortens hunting seasons and pushes bears onto land for longer stretches.
On land, seals are hard to find and freshwater is hit-or-miss. Loss of ice also means fewer places where snow and ice build up stable pools or dens.
That’s a problem because eating snow for hydration burns energy and can waste precious body heat. When sea ice breaks up earlier in the year, pregnant females may have to den in warmer or wetter spots, which stresses both moms and cubs.
If you want to learn more about how shrinking ice affects polar bear habitat and feeding, check out WWF’s reporting on polar bear threats in the Arctic: https://www.arcticwwf.org/wildlife/polar-bear/polar-bear-threats/
Behavioral Adaptations to Prevent Dehydration
You’ll notice polar bears go straight for seal blubber when they can. They get most of their water from breaking down fat, so it just makes sense to eat the fattiest part first.
When they’re stuck on land, their menu changes. Sometimes they’ll eat bird eggs, berries, or even rummage through human trash. These foods don’t offer much fat, though, so they get less water that way.
Bears often slow down and move less to save both water and energy. You might spot them resting a lot more when food runs low.
Mother bears sometimes wait longer before leaving their dens, just to keep their cubs safe. Their kidneys do a pretty amazing job, too—they concentrate urine to hang on to as much water as possible. That really helps when there’s hardly any fresh water around.
Curious about how polar bears manage their water needs without really drinking? Check out this easy-to-read article from the San Diego Zoo: https://science.sandiegozoo.org/science-blog/polar-bears-water-open-water-everywhere.
