Hundreds of thousands of years ago , a antecedently unsung mintage of imitator drift the forests of Central Africa . We bed   this not because archeologists have unearthed physical grounds but because there are clues in Pan paniscus DNA , New Scientistreports .

pygmy chimpanzee would have co - existed with this mystery ape and even mated to develop fertile offspring . Hence , the species inhabit on , if only in its descendant ' factor .

Martin Kuhlwilm from the Institute of Evolutionary Biology in Barcelona , Spain , lay out the inquiry at   the AsiaEvo league in China . He " find " this whodunit ( or " ghost ) anthropoid after compare the   genes of Pan paniscus and common chimp , searching for any rum traces or gonzo fragments of desoxyribonucleic acid that could not be excuse either by mutations or mating between the two species .

And he found some in the gene of the Pan paniscus . In fact ,   more or less 1 percent of the bonobos ' genes was inherit from this ghost ascendant . He   depend that   the two chimp species likely interbred 400,000 or so days ago .

This would   not be the first example of two freestanding species couple to   make so - called viable offspring . For example , there is thebeefalo – a cross between a cow and a buffalo , not a chunk of meat . Then there are study suggesting that red and easterly wolves are not so much their own species butcoyote - grey wolf hybrids .

Evolutionarily speaking , hybrids can in fact help fortify a species by usher in utilitarian desoxyribonucleic acid . Big African tea have a long chronicle of interbreeding , even before humans sought to get a degraded buck from   ligers and tigons , and crossbreed may be responsible for forimproving Panthera onca ' visual modality .

As for human being , new research corroborate our antecedent commence busy with some of our hominid relatives . Around1 to 3 percent of DNAin people out of doors of sub - Saharan Africa is Neanderthal , andDenisovan DNAis what allows people in Tibet to survive in high EL .

Which brings us to   so - called " ghost species " , species that are only known through fragments of desoxyribonucleic acid pass off down to their descendant . A2017   studydiscovered a disoriented hominin via forward-looking human spitting . It was this study that inspired   Kuhlwilm to explore for singular bits of DNA in pygmy chimpanzee and chimpanzee , and it makes you wonder , how many more " ghost " species are ambuscade in genomes across the animal kingdom ?

[ H / T : New Scientist ]