Anderson KA, Teichroeb JA, Ramsay MS, Bădescu I, Lo ´pez-Torres S, Gibb JK (2024) Same-sex sexual behaviour among mammals is widely observed, yet seldomly reported: Evidence from an online expert survey. PLoS ONE 19(6): e0304885. https://doi.org/10.1371/journal.pone.0304885
Reagan, Natalia.Hooray for Gay Animals! 9 Species That Are Also Celebrating (неопр.). huffingtonpost.com. Huffington Post (6 июля 2015). — «Did you know that at least 1500 species of animals have been engaging in homosexual activity sans judgment from their peers for eons? Yes, that’s right. Homosexual encounters have been documented in a multitude of species ranging from penguins, in matching tuxedos, to giraffes to bonobos to bison!» Дата обращения: 23 февраля 2018. Архивировано 25 февраля 2017 года.
Fereydooni, Arash.Do Animals Exhibit Homosexuality? (неопр.)yalescientific.org. Yale Scientific Magazine (14 марта 2012). — «Although Darwin’s theory of natural selection predicts an evolutionary disadvantage for animals that fail to pass along their traits through reproduction with the opposite sex, the validity of this part of his theory has been questioned with the discoveries of homosexual behavior in more than 10% of prevailing species throughout the world. Currently, homosexual behavior has been documented in over 450 different animal species worldwide.» Дата обращения: 23 февраля 2018. Архивировано 1 марта 2018 года.
Reagan, Natalia.Hooray for Gay Animals! 9 Species That Are Also Celebrating (неопр.). huffingtonpost.com. Huffington Post (6 июля 2015). — «Did you know that at least 1500 species of animals have been engaging in homosexual activity sans judgment from their peers for eons? Yes, that’s right. Homosexual encounters have been documented in a multitude of species ranging from penguins, in matching tuxedos, to giraffes to bonobos to bison!» Дата обращения: 23 февраля 2018. Архивировано 25 февраля 2017 года.
Fereydooni, Arash.Do Animals Exhibit Homosexuality? (неопр.)yalescientific.org. Yale Scientific Magazine (14 марта 2012). — «Although Darwin’s theory of natural selection predicts an evolutionary disadvantage for animals that fail to pass along their traits through reproduction with the opposite sex, the validity of this part of his theory has been questioned with the discoveries of homosexual behavior in more than 10% of prevailing species throughout the world. Currently, homosexual behavior has been documented in over 450 different animal species worldwide.» Дата обращения: 23 февраля 2018. Архивировано 1 марта 2018 года.