Lions

Lions are feline apex predators found in Westeros and other continents. Lions feature prominently in Westerosi heraldry, as the sigils of both House Lannister and the extinc House Reyne feature lions.

Lord Tytos Lannister was nearly killed by a lioness but was saved by the kennelmaster of Casterly Rock.

In the books
In the A Song of Ice and Fire novels lions inhabitted the western hills of Westeros but have been nearly hunted down to extinction. The Dothraki Sea, however, is inhabitted by white subspecies of lion, called hrakkar by the Dothraki.

The Prince of Pentos is mentioned to keep a pride of lions in his menagerie. Also, when Queen Cersei Lannister was a child, lions were kept caged in the bowels of Casterly Rock, a legacy from the days of Lord Tytos.