Original: Around the time of the OpenBSD 2.7 release, the original mascot, a BSD daemon with a trident and halo, was replaced by Puffy, traditionally said to be a pufferfish.
Simplified: OpenBSD's first mascot was a BSD daemon with a halo, it was replaced with Puffy, a pufferfish, on June 15th, 2000, with the release of OpenBSD 2.7.