A lot of very plausible explanations of present animal behavior use the following template: "individuals do the most to help survive and reproduce for those who share genes the most." For example, polyandry is rare, yes, but when it does occur, the two males are brothers. Other examples have to do with sharing food, etc.
My thought: the behaviors are all consistent with the aforementioned hypothesis. But they might also be consistent with hypothesis that "the familiar get treated like family." It would be interesting to see who got preferential treatment... a sibling from whom an animal was separated long ago, or a non-sibling with whom the animal has been living for a long while. Perhaps sometimes familiarity trumps family; other times not...
My thought: the behaviors are all consistent with the aforementioned hypothesis. But they might also be consistent with hypothesis that "the familiar get treated like family." It would be interesting to see who got preferential treatment... a sibling from whom an animal was separated long ago, or a non-sibling with whom the animal has been living for a long while. Perhaps sometimes familiarity trumps family; other times not...
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