Not FMLA, not “you can use up all your vacation time.” Has anyone ever worked at one or heard of one?

I ask because even though I’m not actively looking for a job right now, I still check out job ads in my field all the time just to get a feel for what’s out there, who’s hiring, what salaries are like. Especially since I want to move to another area in the next few years and want to get a sense of the type of jobs I could get there. I always check on employer benefits if it’s listed on their sites and I don’t think I’ve ever seen maternity leave listed. Many list child care options but that’s it. I’m typically looking at nonprofits or universities, so maybe that’s it but...damn. How rare is this in the U.S.?