BBC Inside Science

Does warm weather mean more rats in UK towns and cities?

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Sep 25, 2025
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INSIGHT

Seasonal Food Drives Rat Numbers

  • Rat populations often grow in summer due to increased food waste from people outdoors.
  • Winters typically reduce rat numbers because people stay home and food waste drops.
INSIGHT

Sizing Up Exaggerated Rat Claims

  • Reports of 20-inch rats are usually misreported measurements and often include the tail.
  • Typical Norway rats weigh about 400–600 grams, not the size of a dachshund.
INSIGHT

Farms Are Major Rat Hotspots

  • Many large rat populations are farm-associated because abundant animal feed provides easy access to food.
  • Urban rats also flourish where people leave compost, bird feed, or overflowing bins.
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