Bubalus palaeokerabau explained

Bubalus palaeokerabau is an extinct species of water buffalo that was endemic to Java during the Late Pleistocene.

B. palaeokerabau can be distinguished from more recent domestic water buffalo introduced to Java by their larger size and their extremely long horns, which can be around 2.5m (08.2feet) long from tip to tip.^{[1] [2]}

Notes and References

1. Hooijer . D.A. . Fossil Bovidae from the Malay archipelago and the Punjab . Zoologische Verhandelingen van de Museum Leiden . 1958 . 38 . 1–112.
2. Book: Albers . P. . de Vos . J. . Through Eugène Dubois' Eyes: Stills of a Turbulent Life . 2010 . Brill . 9789004183001 . 54.