Spallanzani is also famous for extensive experiments in 1793 on how bats could fly at night to detect objects (including prey) and avoid obstacles, where he concluded that bats do not use their eyes for navigation, but some other sense. He was originally inspired by his observation that tamed barn owl flew properly at night under a dim-lit candle, but struck against the wall when the candle was put out. He managed to capture three wild bats in Scandiono, and performed similar experiment, on which he wrote (on 20 August 1793):