Try looking at the giraffe's recurrent laryngeal nerve. What isn't beneficial is sometimes retained as long as the cost isn't bad enough to impair reproduction

Try looking at the giraffe's recurrent laryngeal nerve. What isn't beneficial is sometimes retained as long as the cost isn't bad enough to impair reproduction. https://en.wikipedia.org/wiki/Recurrent_laryngeal_nerve#Evidence_of_evolution https://en.wikipedia.org/wiki/Recurrent_laryngeal_nerve#Evid...