Polar bears sexual or gans

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Persistent pollutants push polar bear penises to breaking point | Research | Chemistry World

The icecap may not be the only thing s hrinking in the Arctic. The genitals of polar bears in east Greenland are apparently dwindling in size due to industrial pollutants. Scientists report this shrinkage could, in the worst case scenario, endanger polar bears there and elsewhere by spoiling their love lives and causing their numbers to peter out. In fact, all marine mammals could get affected by these pollutants, "especially the Arctic fox, killer whale and pilot whales," wildlife veterinarian and toxicologist Christian Sonne at the National Environmental Research Institute of Denmark in Roskilde told LiveScience. These animals bodies also carry extremely high levels of these contaminants. Polar bears from northernmost Norway, western Russia and east Greenland are among the most polluted animals in the Arctic, as they feast on ringed seals and bearded seals.
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Arctic pollution causing polar bears to change sex

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Age at sexual maturity among male polar bears Ursus maritimus and timing of the mating season were studied by microscopic and macroscopic analysis of the reproductive organs from male and 92 female Greenland polar bears. Males became sexually mature in the spring following their fifth birthday. Some spermatozoa were found in 2- to 4-year-old bears during the spring, but only in low concentrations in a mixture of other cell types. The first corpus luteum was found on 1 April and most ovulations were estimated to occur before mid-May which indicate that the peak of the mating season begins in late March and ends in May. These findings are somewhat different from a similar study from Svalbard, where the mating season is estimated to peak later and male polar bears are found to become mature earlier.
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