We report the first record of Rufous-thighed Kite Harpagus diodon in Colombia, the north-westernmost documented record of this species during its non-breeding season. In addition, we conducted a spatiotemporal analysis of the species' distribution based on a compilation of available records. Documented records evidence that this raptor either moves further north-west than was previously assumed, or that vagrants reach north-western Amazonia, suggesting that further ornithological research into austral and intra-tropical migrants in southern Colombia is needed. Differences between patterns of documented and undocumented records of this species suggest the need for multimedia evidence to substantiate data generated by citizen science initiatives.