Why a turtle can't trot. How might fancy movements of a gaited horse might derive from the primitive walk of early tetrapods. Breathing while trotting. Convergent evolution of bipedal locomotion. Why kids, but not adults, skip.
Gills make jaws make ears make room for a big brain.
Debates on the origin of jaws. Hox genes yet again. 25 Nov 25. Anatomical tour of the mammalian brain. Wed 2 Dec 27.