martes, 29 de septiembre de 2015

Are there any social, patrilineal mammals where breeding age females are forced to leave the family group?

There are many matrilineal mammal groups from lions to orcas to chimpanzees (I think).  Are there any cases where the males stay with the family group as they mature and females that enter breeding age are forced out, or does the nature of mammalian child rearing make this highly unlikely due to the need to nurse?
The answer:
Royals and old moneyrs come to my mind. And stay in for good reasons. Humans in general have very ancient formula of female juvenile dispersal, and the most clear examples in western history and society are found in these types of families.

Because we are talking about sex biased juvenile dispersal.

- Apart from humans, the animal that seems to fit better in your description is painted wolf (Lycaon pyctus). And I refer to them with a bit of surprise, I used to think that they are the canine mirror of hyenas, but this is wrong when it comes to sex ratios in packsis as biased as 3 males for every female, and males consistently remain in their natal pack while females disperse.  It is very significative the fact that reproductive females are terrificly prolific, with an average of 10 puppies by litter.
- Many primates, like chimpanzees, gorillas and red colubuses. Yes, chimpanzes practise female dispersal. It is bonobos the species that opts for male dispersal. This doesn't mean that male dispersal is absent, but that female dispersal is the general rule. (Humans have been mentioned before).

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