How are polar bears becoming extinct?
There are 19 distinct subpopulations of polar bears living in the Arctic, and each population will be affected somewhat differently. Without human intervention, most polar bear populations will be extinct in 30-40 years (Castro de la Guardia 2013, Stirling 2012)).
- Threats: Decline in numbers due to habitat loss and persecution at the hands of humans. They are hunted by farmers as a result of assumed or actual threats to livestock including cattle and goats. Spotted hyenas have also been hunted for body parts to be used in traditional medicine.
- Hyenas generally aren't actively hunted by other predators, but will be eaten if found as carrion. Lions do occasionally kill and eat a hyena, but lower-risk prey (ie prey less likely to try and kill you back) is generally the preference of predators.
- Siberian: This species' diet ordinarily consists of about 50% wild boar meat. If they cannot get their paws on some wild boar they have been known to eat elk, deer, lynx and sometimes even bears. If large sources of meat are not readily available, Siberian Tigers will eat rabbits, fish, and any rodents they can get to.
Because of ongoing and potential loss of their sea ice habitat resulting from climate change, polar bears were listed as a threatened species in the US under the Endangered Species Act in May 2008. The survival and the protection of the polar bear habitat are urgent issues for WWF.
- This trade, fueled by soaring prices and fed solely by Canada, contributes to the killing of 500 to 600 polar bears every year, provides cover for poaching in Russia and has resulted in an unsustainable hunt for many polar bear populations. Isn't the biggest danger to polar bears climate change? Of course it is.
- Inhabiting the ice and sea of the Arctic, polar bears are well-equipped for survival in a harsh environment. Two coats of fur and a thick layer of blubber help insulate the polar bear's body from the cold, keeping its temperature at an even 37° C (98.6° F).
- Why is the polar bear important? As an apex predator at the top of the food web, polar bears can signal that there are problems in the Arctic marine ecosystem. They are likely to be among the most significantly affected species as the Arctic warms and sea ice melts.
Climate change, and the loss of sea ice habitat, is the greatest threat to polar bears. The impacts of this change are felt first and worst in the Arctic. Polar bears rely on sea ice to hunt and store energy for the summer and autumn, when food can be scarce.
- Adaptions of polar bears
adaptation reason small ears reduces heat losses strong legs for swimming and running helps them catch their prey thick layer of blubber - fat insulation and a store of energy thick layer of white fur insulation against the cold, and for camouflage
- Q. Do the butterflies die after they lay their eggs? A. No, they don't. Adult monarchs live for anywhere from 2 to 6 weeks, and females lay eggs and males mate throughout most of this period. (Assuming that they aren't in the generation that migrates.)
- By marking butterflies then recapturing or sighting them later, scientists gain information on how long butterflies can live. An average butterfly species has an adult life span of two weeks or less. For example one butterfly studied in Costa Rica had a life expectancy of about two days, and live ten days at the most.
Updated: 15th October 2018