If you’re gonna be anal about it, technically “laying” could be argued to be inaccurate, (although then you’d get into the semantics about how it’s technically referring to careful putting down, and I don’t know if you could argue that for like, pigeons), but I’d definitely agree that all mammals have eggs.
All mammals lay eggs. Most of them just lay eggs inside themselves.
If you’re gonna be anal about it, technically “laying” could be argued to be inaccurate, (although then you’d get into the semantics about how it’s technically referring to careful putting down, and I don’t know if you could argue that for like, pigeons), but I’d definitely agree that all mammals have eggs.