Googling cross-species adoption gets you a few articles, none of them very notable but together suggestive that the 'cuteness' factor, or some other factor or combination does operate more often than one would think in the wild. These adoptions seldom end well, it seems, with the exception of birds, many of whom seem willing to raise almost anything with feathers and sometimes without.
One article noted that carnivores fostered by prey animals (example kittens fostered by a chicken or raised with domestic rats) were observed as adults to not attack members of the species they were fostered with.
http://www.divinecaroline.com/article/22353/50203-food-friend--animals-adopt-species
One article noted that carnivores fostered by prey animals (example kittens fostered by a chicken or raised with domestic rats) were observed as adults to not attack members of the species they were fostered with.
http://www.divinecaroline.com/article/22353/50203-food-friend--animals-adopt-species
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