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We've already covered the navigation controls in the left-hand bar. There are also navigation controls in the top right corner of each page ("Previous" and "Next") and at the bottom of the page.

Also at the bottom of the page is a link to skip to the top of the page. This link is omitted on short pages, such as this one.

The "Principles of Animal Behavior" logo at the top of the left-hand bar also functions as a link to the home page.

Finally, for visually-impaired users who are using a screen reader, there is an invisible "skip navigation" link at the very top of the left-hand bar, to skip to the content of the page. This is so the user doesn't have to listen to all the links at the beginning of every page.