I have this page:

<http://www.comehike.com/outdoors/birds/birds.php>

The left side (on the middle) has a list of birds. But for some reason, the web page renders only half of the bird list. If I do view-source, I see the entire bird list.

If I look at the page in Firebug, it shows the spacing of the divs as I expected it, but for some reason, just the top part of the list of birds doesn't appear.

Any idea why that is happening?

Thanks!