Wikipedia: wikipedia-en (English)

EOL harvests articles from wikipedia that are indexed as species or higher taxa.

Wikipedia is a multilingual, web-based, free-content encyclopedia project supported by the Wikimedia Foundation and based on a model of openly editable content. The name Wikipedia is a portmanteau of the words wiki (a technology for creating collaborative websites, from the Hawaiian word wiki, meaning quick) and encyclopedia. Wikipedia articles provide links designed to guide the user to related pages with additional information.

https://en.wikipedia.org