Such questions deserve consideration before drawing conclusions. Dawkins notes his familiarity with the giraffe example as due to Prof. J. D. Currey, but no citation is provided nor could I find one using Melvyl's journal databases. This is a post that presents evidence to back up my claim that there is evidence of jury-rigged design in nature. The first part is mine, the rest is assembled from contributions of others. In any case, I'd like to thank all the contributors to this almost Meritt-like gargantuan post.
Many organisms show features of appallingly bad design.
This is called historical constraint. Fertility in these lizards is increased when another lizard engages in pseudo male behavior and attempts to copulate with the first lizard. These lizards evolved from a sexual species so this behaviour makes some sense. The hormones for reproduction were likely originally stimulated by sexual behaviour. Now, although they are parthenogenetic, simulated sexual behaviour increases fertility.