Macintosh has named six of its operating systems after big cats. What big cat did Macintosh name their 2007 release after?

The story behind the answer

Apple’s 2007 Mac OS X release was 10.5, codenamed Leopard. It followed Tiger (10.4, 2005) and introduced hallmark features like Time Machine backups, Spaces (virtual desktops), Quick Look, and a revamped Finder—making Leopard the clear match among the choices. Panther (10.3) and Puma (10.1) were earlier versions.

Context: From 2001 to 2012, Apple named Mac OS X versions after big cats before switching to California place names (Mavericks onward). A memory tip: think “stripes before spots”—Tiger’s stripes came first (2005), then Leopard’s spots in 2007, and finally a refinement, Snow Leopard, in 2009.