The First Computer Bug Was an Insect - Apparently.
In 1947, a team of engineers working on the Harvard Mark II computer discovered a moth stuck in one of the relays, causing problems with the system. They taped the moth to the computer log with the note "First actual case of bug being found." This incident is often cited as the origin of the term "computer bug," and it's still documented in the archives of the Harvard Computing Collection. The moth is now on display at the Smithsonian National Museum of American History.