"I thought: 'Somebody's fooling with me. It's just too perfect,'" museum volunteer Chris Johnson, a naturalist by trade, said of the moment he first spotted the butterfly. "Then I got goose bumps."
After isolating the butterfly, Johnson and his supervisor called for expertise. Jason Weintraub, a lepidopterist (butterfly expert) and the director of the museum's insects collection, confirmed the butterfly was half-female, half-male -- a relatively rare example of bilateral gynandromorphy.