Berenstain Bears by the Sea

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When the mating season ends, the female will build up more fat reserves to sustain both herself and her young. Sometime between August and October, the female constructs and enters a maternity den for winter. Depending on the area, maternity dens can be found in sea ice just off the coastline or further inland and may be dug underneath snow, earth or a combination of both. [122] The inside of these shelters can be around 1.5m (4.9ft) wide with a ceiling height of 1.2m (3.9ft) while the entrance may be 2.1m (6.9ft) long and 1.2m (3.9ft) wide. The temperature of a den can be much higher than the outside. [123] Females hibernate and give birth to their cubs in the dens. [124] Hibernating bears fast and internally recycle bodily waste. Polar bears experience delayed implantation and the fertilized embryo does not start development until the fall, between mid-September and mid-October. [125] With delayed implantation, gestation in the species lasts seven to nine months but actual pregnancy is only two months. [126] In the book , Brother is wearing a red short sleeve with blue pants, on the show he was only seen wearing red and white trunks Auger-Méthé, M.; Lewis, M. A.; Derocher, A. E. (2016). "Home ranges in moving habitats: polar bears and sea ice". Ecography. 32 (1): 26–35. doi: 10.1111/ecog.01260. a b Committee on Taxonomy (October 2014). "List of Marine Mammal Species & Subspecies". The Society for Marine Mammalogy. Archived from the original on 6 January 2015.

In 2015, the IUCN Red List categorized the polar bear as vulnerable due to a "decline in area of occupancy, extent of occurrence and/or quality of habitat". It estimated the total population to be between 22,000 to 31,000, and the current population trend is unknown. Threats to polar bear populations include climate change, pollution and energy development. [2] Pinnipeds split from other caniforms 50 mya during the Eocene. Their evolutionary link to terrestrial mammals was unknown until the 2007 discovery of † Puijila darwini in early Miocene deposits in Nunavut, Canada. Like a modern otter, † Puijila had a long tail, short limbs and webbed feet instead of flippers. [20] The lineages of Otariidae (eared seals) and Odobenidae (walrus) split almost 28 mya. [21] Phocids (earless seals) are known to have existed for at least 15 mya, [22] and molecular evidence supports a divergence of the Monachinae (monk seals) and Phocinae lineages 22 mya. [21]Wood, G. L. (1983). The Guinness Book of Animal Records. Guinness Superlatives. p. 28. ISBN 978-0-85112-235-9.

Meier, W. N. & Stewart, J. S. Assessing uncertainties in sea ice extent climate indicators. Environ. Res. Lett. 14, 035005 (2019).Wilson, R. R.; Horne, J. S.; Rode, K. D.; Regher, E. V.; Durner, G. M. (2014). "Identifying polar bear resource selection patterns to inform offshore development in a dynamic and changing Arctic". Ecosphere. 5 (10): 1–24. doi: 10.1890/ES14-00193.1. Rain season: Jan 1st to Dec 31st. 2 Snow season July 1st to June 30th. 3 Snow manually measured usually around 7AM and 7PM. 4 Updated at Noon. 5 Estimated amount of water needed to replace the water used by plants and evaporation from the past week. (Negative numbers mean amount of water needed, positive numbers mean excess water is present). 7 Leaf Wetness is surface moisture on foliage. 0 being totally dry and 15 being totally saturated. 8 Soil moisture and temperatures are from sensors burried in the ground at the levels specified. 10 Historical average only to day 27 of just the month of November for this station since 2010. 11 Historical average rain this season to day 27 of November for this station since 2010.

a b c Ovsyanikov, N. G. (2005). "Behavior of polar bears in coastal congregations" (PDF). Zoologicheskiĭ Zhurnal. 84 (1): 94–103. a b Cahill, J. A.; Heintzman, P. D.; Harris, K.; Teasdale, M. D.; Kapp, M. D.; Soares, A. E. R.; Stirling, I.; Bradley, D.; Edward, C. J.; Graim, K.; Kisleika, A. A.; Malev, A. V.; Monaghan, N.; Green, R. E.; Shapiro, B. (2018). "Genomic evidence of widespread admixture from polar bears into brown bears during the last ice age". Molecular Biology and Evolution. 35 (5): 1120–1129. doi: 10.1093/molbev/msy018. PMID 29471451.

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Marine mammal adaptation to an aquatic lifestyle varies considerably between species. Both cetaceans and sirenians are fully aquatic and therefore are obligate water dwellers. Pinnipeds are semiaquatic; they spend the majority of their time in the water but need to return to land for important activities such as mating, breeding and molting. In contrast, both sea otters and the polar bear are mostly terrestrial and only go into the water on occasions of necessity, and are thus much less adapted to aquatic living. The diets of marine mammals vary considerably as well; some eat zooplankton, others eat fish, squid, shellfish, or seagrass, and a few eat other mammals. While the number of marine mammals is small compared to those found on land, their roles in various ecosystems are large, especially concerning the maintenance of marine ecosystems, through processes including the regulation of prey populations. This role in maintaining ecosystems makes them of particular concern as 23% of marine mammal species are currently threatened. Raypole, Crystal (13 May 2023). "Inside Canada's polar bear 'jail' where bears go without food and are kept behind bars — but it's not what you might think". Business Insider . Retrieved 3 September 2023.