At my DC's school the captain of the boys rugby team is a trans boy (a girl transitioning to a boy) 14yo. He's identified as a boy since 8yo and to look at him you'd never know.
There are a couple of things that puzzle me. The first is how he can possibly be fast/strong enough? The other is whether this is the same issue as men taking over women's sport?
I was inclined not to believe it when I first heard, but it's true.