第三段：To determine what orientation information S. satyrus extracts from the starry sky—despite the theoretical limitations of its visual system—we moved our wooden arena into the Johannesburg planetarium. Here, approximately 4,000 stars and the Milky Way (as a diffuse streak of light) can be projected onto the 18 m diameter domed ceiling. We found that beetles took the same amount of time to exit the arena, irrespective of whether they could see the full projection of the starry sky (including the Milky Way; 43.3 ± 6.9 s, n = 13) or only the Milky Way (53.3 ± 12.1 s, n = 10; t test, T48 = 0.60, p = 0.55). This indicates that on a moonless night, S. satyrus orientates using the bright band of light produced by the Milky Way. … This clearly shows that the beetles do not orientate to a single bright “lodestar,” but rather to the band of light that represents the Milky Way.