Web sites are constantly being updated, altered and deleted. When using Web sites as source information for papers, etc. Always note the date you used the site on the copy and when citing the source. Check for the date the page was last up-dated. Awards and positive reviews show that the page has been recognized by peer groups or information professionals.
Good sites are candidates for bookmarking.
The following sites all provide information on frogs, but from a variety of different perspectives. To inform and educate. This site is maintained by the National Biological Information Infrastructure. This is an online article. The author is immediately apparent, and there is a link to the newspaper in which the article appeared.