On: Pregnancy Discrimination Is Rampant Inside America...

[untog]

I ask again: what biological pressures would lead to a father spending less time with his children?

[Geeek → untog]

I missspoke. I meant bioligical reality which perhaps caused societal reality.

[kgwgk → untog]

If you're actually interested in theories that have been discussed: https://en.wikipedia.org/wiki/Parental_investment

[untog → kgwgk]

"This article is about parental care in animals. For human parenting, see parenting."

[kgwgk → untog]

That note is misleading or wrong. Humans are animals and the article contains several explicit references to human parenting.