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Do animals have sex with their parents? - Quora
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Pet Subjects: Do animals know it's wrong to breed with their siblings?
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Do animals recognize their siblings? If so, do they treat each other more favorably when they are competing for things such as food or mates? - Quora
Mating With Relatives? New Research Shows It Is Not a Big Deal in Nature
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Demystifying Inbreeding | Dog Aging Project
Siblicide - Wikipedia
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Cat reproduction - 7 facts you probably don't know - RSPCA
Alloparenting - Wikipedia
