Groves and Westwood's study

Like Klein, Groves and Westwood relied on measurements provided by museum staff, looking at these measurements from the "Glasgow" and "Amsterdam" skulls:

"Greatest skull length, condylobasal length; biorbital width (widest, i.e. on lower orbital rims); maxillary toothrow length (alveolar); maxillary premolar row length (alveolar); mandibular toothrow length (alveolar); mandibular premolar row length (alveolar); length of orbital rim occupied by lacrimal bone; width across horn bases; width of one horn base."

On the basis of statistical analysis of these measurements in comparison with the two living Hippotragus species, they summarised that both skulls were female. (In adult males of Hippotragus species the horns elongate and curve down in adulthood, while the tips of the horns of females stop growing.) While one analysis placed the Glasgow skull close to the range expected for sable antelopes (Hippotragus niger, the authors felt there were sufficient distinguishing features - the horn cores were medially flattened and the lacrimal bone very small.

"We are convinced they [the skulls in Glasgow and Amsterdam] are genuine skulls of the extinct blaauwbok." (1995:317)

Groves and Westwood believed it was a young female adult, and were satisified that it was not the only possible alternative - a Sable Antelope.

In balance the 'jury' - including Broom and Mohr as well as Groves and Westwood - seems content that the Glasgow skull was indeed once part of a living Blue Antelope.

Reference: Groves, CP and Westwood, CR. (1995) ‘Skulls of the Blaaubok Hippotragus Leucophaeus’, Z. Saugetierkunde 60: 314-318.