which makes both male and female grey squirrels infertile, should be ready to deploy in the wild within two years. Grey squirrels, first introduced from North America in the late 19th century ...

Squirrels take part in "mating chases" and a male black fox squirrel "most likely" mated with a female grey, Dr McRobie said. Amanda K Ciurej The black squirrel is known as melanic Dr McRobie ...