Twins And Human Evolution?

[+ Avalon]

Human females have two breasts yet single births is the norm.

 

Many mammal species have more than two breasts and have multiple births.

 

Do you think that at one time in human evolution that having twins was ever the norm?

[mike carey]

It's more, perhaps exclusively, about symmetry.

[510guy]

Cows have four teats on the udder but only one calf so your logic does not prevail.

[+ Avalon]

Cows have four teats on the udder but only one calf so your logic does not prevail.

 

Good point! I had been thinking about cats and dogs having litters.