Someone needs to explain their wacky biology to me, please. My four questions are these.
(The following are spoilers for the 'Hibernaculum' episode of Grimm Season Four)

  1. I understand that cold-blooded creatures lose heat, but in the episode with Varme Tyv in it, it wasn't even cold outside, as said by other characters. So how did the Gundersons die and get covered in ice within such a short time?

  2. What exactly allows one to suck the heat from your body with a bite?

  3. The phrase Varme Tyv means 'Heat Theif' in Swedish and Norwegian. Under the assumption that the Wesen in Grimm are all based on fairy tales, what nordic tale inspired these reptilian creatures?

  4. Monroe says that a Varme Tyv could 'freeze to death while sitting next to a campfire' because they only process human body heat. But they were fine driving in a car. And produced steaming heat when lying together in the hibernaculum. So if the only thing in this world that can warm them is taking heat from humans, then how is the Varme Tyv not extinct?

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    Welcome to SFF.SE! We recommend 1 question per question here, so you should probably split this into 4 separate posts. – Rand al'Thor Jan 31 '16 at 1:16
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    I would say questions 1, 2, and 4 are all pretty related, as they ask how the biology of these creatures is supposed to work (it didn't make any sense to me either). Question 3 really should be split into a separate question. – varradami Jan 31 '16 at 17:35
  • As an aside, I'm not sure who felt it necessary to downvote this question, but maybe give new users some leeway if they ask a good question in the wrong way? Otherwise you may drive away new users. – varradami Jan 31 '16 at 17:38
  • @varradami - Question 3 was worded poorly, and I apologize. I didn't understand what Brothers Grimm tale could have inspired white snake Wesen from Scandinavia that function like that. A little counterintuitive to have them freeze even in hot climates yet originate from a cold one, don't you think? – Anonymía Jan 31 '16 at 17:41
  • Correction: varme tyv means ‘(the) hot thief’ in Danish and Bokmål Norwegian. It doesn't mean anything in Swedish (it would be varma tjuv there). ‘Heat thief’ would be varmetyv in Danish/Bokmål or värmetjuv in Swedish. The notion of heat-stealers does sound vaguely familiar from some folktale aspect, but I can't remember what it is it’s reminding me of. – Janus Bahs Jacquet Jan 31 '16 at 17:51

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