In the domains of communicative development, species recognition, OR motor development, what are important developmental challenges facing a third-trimester fetus and a neonate (within a couple days of birth) in humans and rats?  To answer this question, describe two characteristics of each developmental niche below.  Your answers should each be, at a maximum, a few sentences in length.  You can stick with one domain for all your answers, or use different domains across your different answers – it's up to you.

1.  Prenatal niche (human)

2.  Early postnatal niche (human)

3.  Prenatal niche (rat)

4.  Early postnatal niche (rat)