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I found myself making an assumption today, along these lines:

You only find large insects in tropical climates.

I was, initially, thinking of tarantulas and other large spiders (I know, not actually insects), but also The Giant Dragonfly, Atlas Moth, Titan Beetle etc.

Here in England, the largest I've come across is a daddy long-legs. They are rarely larger than, say, 3cm from toe to toe.

I don't know of any super-sized mini beasts in colder climates.

So there's really two questions here:

  • Are there huge insects (or arachnids) naturally found in temperate to cold climates?
  • If this assumption is true, why is this?
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    $\begingroup$ Dragonflies in Europe can be up to 8cm (cordulegaster, anax), but I think your assumption is generally right. Insects growth rate is strongly related to temperature, that will probably be the reason. $\endgroup$ – RHA Sep 14 '17 at 15:41
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    $\begingroup$ @RHA That's interesting. So insects grow faster in higher temperatures? $\endgroup$ – AJFaraday Sep 14 '17 at 15:42
  • $\begingroup$ Yes. Well, most insects do not grow at all, but the growth rate of their larvae depends on temperature (and other factors like food supply). $\endgroup$ – RHA Sep 14 '17 at 15:48
  • $\begingroup$ @RHA Does that mean that one could 'manufacture', say, a giant fly by nurturing a maggot? $\endgroup$ – AJFaraday Sep 14 '17 at 15:49
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    $\begingroup$ No. If you would 'spoil' your maggot, it would probably be bigger than average, but not a giant. How big a species becomes depends largely on their genes. Think of humans: enough good food makes you taller, but too much food only makes you fatter. $\endgroup$ – RHA Sep 14 '17 at 15:56

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