https://www.countrylife.co.uk/nature/jackdaw-bird-just-loves-people-178185
They regularly make same-sex love matches – particularly in captivity
Dr Lorenz also discovered that, although the birds normally pair for life, jackdaws in captivity tend to form same-sex pairs. Research in the Netherlands in the 1970s went a step further by concluding that such pairings occur in the wild and that among females that have lost their mates, 10% bond with other females and 5% form a same-sex ménage a trois.
This aspect was pursued in detail by Canadian biologist Bruce Bagemihl in his 1999 book Biological Exuberance: Animal Homosexuality and Natural Diversity, in which he described widespread ‘non-procreative sexuality’ in the natural world. Jackdaws are among many species that may form same-sex pairs, he declared.