Rana arvalis
The moor frog (''Rana arvalis'') is a slim, reddish-brown, semiaquatic amphibian native to Europe and Asia. Moor frogs are known for their ability to freeze solid and survive thawing. The frog makes use of various cryoprotectants i.e. Antifreeze protein, antifreeze that decreases its internal freezing temperature. The species is distributed over a large range, covering a significant portion of Eurasia. Male moor frogs are known to turn blue temporarily during the height of mating season. This coloration is assumed to signal a mate's Mate choice, fitness. Moor frogs typically mate through Multi-male group, multimale amplexus a form of polyandry. The moor frog Spawn (biology), spawns its eggs in large batches in still bodies of acidic waters. Human-caused pollution is causing excessive Freshwater acidification, acidification of habitat which harms egg health. The moor frog's habitat is also under destruction due to a variety of other Anthropogenic hazard, anthropogenic means. The s ...
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Sven Nilsson (zoologist)
Sven Nilsson (8 March 1787 – 30 November 1883) was a Swedish zoologist and archaeologist. Life and work Nilsson was director of the Naturhistoriska Riksmuseet (Sweden's natural history museum) from 1828 to 1831, professor of Natural History at Lund University from 1832 to 1856, and rector of Lund University from 1845 to 1846.Chambers' Encyclopedia Volume 10 page 43 Nilsson was a prolific author, publishing large works on different groups of the fauna of Scandinavia. He worked as a field archaeologist and introduced ethnographic perspectives in archaeology. He was made a member of the Royal Swedish Academy of Sciences in 1821. Nilsson corresponded with William Yarrell, acting as the authority on Swedish avifauna for Yarrell's ''History of British Birds (1843)''. For example, Yarrell records Nilsson as saying "it infests every house", referring to the house sparrow. He was elected as a member of the American Philosophical Society in 1869. Legacy *A genus of turtles, '' N ...
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