== Eksterne henvisninger ==
{{commons|Equus caballus}}
* [http://news.bbc.co.uk/1/hi/sci/tech/4618571.stm 2 July, 2005, New insight into horse evolution] Citat: "...North America was thought to be home to as many as 50 species and subspecies of horse..."It looks like, as far as we can tell from the DNA, there is only evidence of two species in North America," Dr Alan Cooper..."Probably these animals are adapting to local environments and perhaps they are [anatomically] more [changeable] than the palaeontologists had perhaps thought."..."
* [https://www.retsinformation.dk/Forms/R0710.aspx?id=2661 Lov om hold af heste]
Psykologi Samfund