However some of the Homo sapiens and Neanderthals interbred. In Eurasia, interbreeding between Neanderthals and Denisovans with modern humans took place several times. Many caves show alternating occupations by hyenas and Neanderthals. The time of divergence of Neanderthals from their ancestor "H. heidelbergensis" is also unclear. However, the Denisovan tooth row was longer than that of Neanderthals and anatomically modern humans. Particularly related to fractures are cases of trauma seen on many skeletons of Neanderthals. The following is a list of physical traits that distinguish Neanderthals from modern humans. There are several instances of Neanderthals practising cannibalism across their range. Yet some scholars still argued for hybridisation with Neanderthals. Nuclear DNA (nDNA) indicates close affinities with Neanderthals. Since 2005, evidence for substantial admixture of Neanderthals DNA in modern populations has accumulated. "Neanderthals", by convention, are fossils which date to after this gap. Fur has long served as a source of clothing for humans, including Neanderthals. The caves contain cultural artefacts and burial grounds of Neanderthals. "Neanderthals&colon; Meet Your Ancestors".