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Many vertebrates use colour vision for vital behaviour but their visual performance in dim light is largely unknown. The light intensity threshold of colour vision is known only for humans, horses and two parrot species. Here, we first explore this threshold in a passerine bird, the blue tit (Cyanistes caeruleus). Using classic conditioning of colour cues to food rewards in three individuals, we find a threshold ranging from 0.05 to 0.2 cd m −2 . Results are comparable to the two previouslydoi:10.1242/jeb.107573 pmid:25214487 fatcat:nlakw7zuhnfmzmntzdnxmeupnu