[citation needed] One is preserved in the Walter Rothschild Zoological Museum at Tring, England, and clearly shows the tendency to dwarfism.

Hagenbeck's cougar/leopard hybrids may have been inspired by a pair of leopard × cougar hybrid cubs born in Chicago on 24  April 1896 at Tattersall's indoor arena, where Ringling Brothers Circus opened its season: "Two tiny cubs which look like young leopards were born at Tattersall's where Ringling Brothers circus is housed, yesterday (24  APR [18]96).

Henry Scherren wrote: There was, and probably is now, in the Berlin Garden and Indian leopard and puma male hybrid, purchased by Carl Hagenbeck in 1898.

Another hybrid between the same species, but with a puma for sire and a leopard for dam, was recently at Stellingen; it resembled the female parent in form as may be seen from the reproduction from a photograph taken there.

[citation needed] According to Carl Hagenbeck (1951), a male cougar and female leopard produced a hybrid male cub that was reared by a Fox Terrier bitch at Hagenbeck Tierpark, Hamburg (fostering being normal practice at this time).

Modern geneticists find them more interesting because the leopard and the cougar were not considered to be closely related enough to produce offspring.

[citation needed] The hybrids were additionally reported by C. J. Cornish et al. (undated), R. Rörig (1903), T. Haltenorth (1936), and O. Antonius (1951).