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Songbirds and Humans Okay, what have we learned so far? We've seen that male and female birds are different. This brings up questions about humans and gender differences, doesn't it? We'll get to that later . . . First, the bird story suggests another question. We've noticed that the bird brains change over time as testosterone exposure causes nuclei to increase in volume . . . and this correlates to changes in behavior! As a male bird gets older (and his nuclei increase in size), he sings more and engages in more courtship behaviors. Human babies act very different than human adults. Do their brains change over time? That's an interesting question! Can we look at human development for a bit, please? HOME || VARIATION || PATHOLOGY || GENDER & SEXUAL ORIENTATION || BIBLIOGRAPHY