Why is an old male reproductively doomed to fail? Is it poor sperm and seminal fluid, or do females not like him and his ejaculate?
https://doi.org/10.1093/evlett/qrae071

Now in @evolletters.bsky.social by @krishsanghvi11.bsky.social, @taralync.bsky.social, et al.

Image: Krish Sangvi & Martin Jahn