Some scientists believe that Koko's ability to communicate through ASL is equivalent to a [[parrot]]'s ability to communicate through speech. Some scientists believe that Koko is only trained to make hand gestures but does not actually understand what she is doing. Young earth [[creationist]]s believe that gorillas were [[creation|created]] about 4000 years ago. According to [[Theory of evolution|evolutionary]] thought, humans shared a common ancestor with gorillas as recently as four to seven million years ago.<ref>Hobolth A, Christensen OF, Mailund T, Schierup MH (2007) Genomic Relationships and Speciation Times of Human, Chimpanzee, and Gorilla Inferred from a Coalescent Hidden Markov Model [http://genetics.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pgen.0030007 PLoS Genet 3(2)]</ref> | Some scientists believe that Koko's ability to communicate through ASL is equivalent to a [[parrot]]'s ability to communicate through speech. Some scientists believe that Koko is only trained to make hand gestures but does not actually understand what she is doing. Young earth [[creationist]]s believe that gorillas were [[creation|created]] about 4000 years ago. According to [[Theory of evolution|evolutionary]] thought, humans shared a common ancestor with gorillas as recently as four to seven million years ago.<ref>Hobolth A, Christensen OF, Mailund T, Schierup MH (2007) Genomic Relationships and Speciation Times of Human, Chimpanzee, and Gorilla Inferred from a Coalescent Hidden Markov Model [http://genetics.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pgen.0030007 PLoS Genet 3(2)]</ref> |