The fossil record adds little to the issue. A humerus some 9,000 years old (i.e., after the last ice age) from the Aswan area in Egypt, where "Falco peregrinus minor" occurs today, was identified as belonging to the peregrine falcon. The Barbary falcon is one of the rare cases that may arguably be considered a species under the biological species concept, but certainly not under the phylogenetic species concept, rather than the other way around as usual. This case demonstrates that what makes a "species" is not only its descent, but also what happens to a population in the course of evolution, how it adapts and how this affects its reproductive isolation (or lack thereof) from sister taxa.