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Quick answer
Odd-coloured amphibians usually turn out to be healthy, native
species that simply have unusual colouring.
Further
information
The UK's amphibians are much more variable in their colouration
than is often thought. This can sometimes make identification
difficult but does mean that whatever you've seen is likely to
be a healthy, native species rather than anything that's ill or
exotic. For example, we often think of common frogs as being a
shade of green or brown but individuals can also be yellow,
orange, red, cream or even black. Male common frogs can develop
a blue tinge to their throats in spring, and females can appear
more pink/red.
Occasionally, a red colouring can be a sign of disease, but
usually only when coupled with other symptoms. If the animal
appears to have similar features to 'ordinary' frogs/toads
then it is most likely this is a common species that is an
unusual colour.
Native amphibians.
Non-native frogs and toads.
Amphibian disease.
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