In the late 1890s/early 1900s, two hybrids were born in Chicago, USA, followed 2 years later by three sets of twin cubs born at a zoo in Hamburg, Germany from a puma father and leopard mother. Carl Hagenbeck apparently bred several litters of puma x leopard hybrids in 1898 at the suggestion of a menagerie owner in Britain; this was possibly Lord Rothschild (as one of the hybrids is preserved in his museum) who may have heard of the two hybrid cubs bred in Chicago in 1896 and suggested Hagenbeck reproduced the pairing.
The Russian blue is a sweet-tempered, loyal cat who will follow her owner everywhere, so don't be surprised if she greets you at the front door! While she has a tendency to attach to one pet parent in particular, she demonstrates affection with her whole family and demands it in return. It's said that Russian blues train their owners rather than the owners training them, a legend that's been proven true time and again.