Beasts

The Beasts tab contains an overview off all non-quest repeatable bosses in-game, how many you've killed and how fast you killed them. It also contains a detailed overview of how many times you killed the most popular slayer creatures. It caps at 60,000 kills.

Learn
As of 9 March 2015, the Beasts tab also has a "Learn" tab under each boss shown. This tab shows an overview of their unique abilities/attacks and if possible, how to avoid them. You can click on the eye on the right side of the description to see the boss using the animation for that ability/attack.