In the season 6 episode, "The Blackout in the Blizzard", Brennan mentions her pet iguana for the first time. This same episode show that one of the numbers of scientific publications that Brennan reads is "Medicinal Physics Quarterly", with one article on electrostatics and triboluminescence proving useful during the lab's power outage. Further concerning her pet iguana in "The Truth in the Myth", as a part of his rehab from alcohol abuse, Vincent Nigel-Murry made apologies for, among other things, having borrowed her iguana one night, wearing him as a hat for a party.