There is also a supersized version:
The Magpie Goose. Geese are already known as violent animals capable of breaking your limbs.
Quote:
Magpie geese frequently will breed in trios and sometimes the females will be mother and daughter.
[...]
Both sexes incubate the eggs, with the male sitting at night.
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Quote:
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Some males mate with two females, all of which raise the young, unlike some other polygamous birds. This may be beneficial when predation of young is high as chicks raised by trios are more likely to survive.
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When ménage à trois is necessary to keep the predators out.
that's Australia folks
I've seen it happen heaps of times, even to dogs that are just chilling in their yards 
