Growing cubs seem to require a predictable dietary source of vitamin D; the concentration in polar bear milk is, on average, 8- to 15-fold higher than in hu- man milk and 1.5-fold higher than supple- mented cow milk. With abundant vitamin D, cubs can be raised in the dark.
Do polar bears get enough vitamin D?
Even polar bears are at risk of developing vitamin D deficiency. … They were found to be severely vitamin D deficient (5). Addition of vitamin D to their diet rapidly cured the rickets, and they became very active and grew well.
How do animals get their vitamin D?
So in these cases, the creatures’ skin secrete oils or waxes which coat and impregnate its fur or feathers. Sunlight then interacts with the oil and produces vitamin D, which is then ingested by the animal or bird when it grooms itself.
How do deep sea creatures get vitamin D?
Because fish may live in deep water and may, thus, not be exposed to solar ultraviolet (UV) light, it is commonly assumed that vitamin D found in their livers and adipose tissue has been derived from a food chain, originating in zooplankton exposed to UV light at the water surface.
Do polar bears eat humans?
Bears. Polar bears, particularly young and undernourished ones will hunt people for food. … Truly man-eating bear attacks are uncommon, but are known to occur when the animals are diseased or natural prey is scarce, often leading them to attack and eat anything they are able to kill.
Do polar bears eat penguins?
Polar bears do not eat penguins, since penguins live in the southern hemisphere and polar bears live in the northern hemisphere.
Why is too much vitamin A bad?
Yes, high intakes of some forms of vitamin A can be harmful. Getting too much preformed vitamin A (usually from supplements or certain medicines) can cause dizziness, nausea, headaches, coma, and even death. High intakes of preformed vitamin A in pregnant women can also cause birth defects in their babies.
What eats a polar bear?
Predators. Adult polar bears have no natural predators except other polar bears. Cubs less than one year old sometimes are prey to wolves and other carnivores. Newborn cubs may be cannibalized by malnourished mothers or adult male polar bears.
Is vitamin A toxic?
Too much vitamin A can be harmful. Even a single large dose — over 200,000 mcg — can cause: Nausea. Vomiting.
Do animals require vitamin D?
Nope, not at all. Other mammals, including our own dogs and cats, synthesize vitamin D just fine because they activate it in their fur instead of their skin. We lost this option when we ditched the fur. Vitamin D deficiency is a uniquely human scourge.
Do we produce our own vitamin D?
How do we get vitamin D? Our body creates vitamin D from direct sunlight on our skin when we’re outdoors. From about late March/early April to the end of September, most people should be able to get all the vitamin D we need from sunlight.
What is the animal source of vitamin D?
Animal foodstuffs (e.g., fish, meat, offal, egg, dairy) are the main sources for naturally occurring cholecalciferol (vitamin D-3).
What food is full of vitamin D?
Good sources of vitamin D
- oily fish – such as salmon, sardines, herring and mackerel.
- red meat.
- egg yolks.
- fortified foods – such as some fat spreads and breakfast cereals.
Which food has the most vitamin D?
Oily fish, as well as oils from fish, have some of the highest quantities of vitamin D in food sources. These may include: Cod liver oil: This contains 450 international units (IU) per teaspoon , which is 75 percent of a person’s recommended daily allowance (RDA).