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As @mgkrebbs mentioned in their answer, Dyacopterus spadiceus and Pteropus capistratus are the males speciees known to lactate. The Wikipedia link also mentions one more species - goats (Gómez et.al., 1999). In fact, male lactation has been observed in a few domesticated animals, including cats and guinea pigs but on rare occasion though it's not yet clear ...


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