IIRC viera are the opposite of hrothgar in that respect. Males viera are rare and valuable and almost never leave their hidden villages.

Which honestly makes more sense than hrothgar having few females. A small number of queens works in egg laying situations (a single bee can lay hundreds of eggs per day) but breaks down in live birth situations when pregnancy lasts months and results in only a small number of births. In that situation having more females than males is much more likely.