Beards are very manly. Masculine. The ladies love them. In fact, beards are all the fashion rage these days, and sure can improve your odds with the ladies.
Nothing says “I am so manly and masculine and virile and I will make the best-looking, strongest, smartest eggs you’ve ever seen” like sporting a beard.
So if you are a single and savvy male 3-toed box turtle and you are out looking for love, you definitely want to show all the single lady box turtles you take a “fashion forward” approach to evolution of the species.