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For a songbird called the common waxbill, dominance isn't governed by body size, intelligence, or even temperament, but by the intensity of the colours in their chest feathers
Some dogs will bark and howl when left alone by their owner, but an analysis of video footage shows getting a second dog may make the problem worse
Some animals can develop problematic behaviours the longer they stay in an animal shelter, but cats tend to become friendlier and less aggressive
A sample of saliva placed on a strip and analysed with a smartphone camera can reveal if a person has ingested cannabis in the last 12 hours
A 99-million-year-old crab trapped in amber might show us when the shelled animals moved into freshwater