![](/../myndir/hvitabirnir_270421.jpg)
Langalgengast er að húnar hvítabjarna séu tveir í goti.
- Molnár, P., Derocher, A., Klanjscek, T. o.fl. (2011). Predicting climate change impacts on polar bear litter size. Nature Communications 2, 186. (Sótt 27.4.2021).
- Demaster, D., & Stirling, I. (1983). The Estimation of Survival and Litter Size of Polar Bear Cubs. Bears: Their Biology and Management, 5, 260-263. (Sótt 27.4.2021).
- Laidre, K. L. o.fl. (2020). Interrelated ecological impacts of climate change on an apex predator. Ecological applications : a publication of the Ecological Society of America, 30(4), e02071. (Sótt 27.4.2021).
- Folio, D. M. o.fl. (2019). How many cubs can a mum nurse? Maternal age and size influence litter size in polar bears. Biology letters, 15(5), 20190070. (Sótt 27.4.2021).
- Mynd: USFWS - flickr.com. (Sótt 27.4.2021).