“…A counterpoint can be found in the fact that an embryo confined in ovo has a quite restricted space in which to move (Hamburger and Hamilton, 1951), resulting in a restricted posture of the embryo during development (Bradley et al, 2014). Such restrictions might have some influence on the outcome of development (Bradley et al, 2014), but the end result is still very much functional (Sun et al, 2018). Such restrictions do not negate that the outcome requires extensive learning, rather that the sensitivity to posture and movement may be somewhat different in these species.…”