It does not, however, become a human-bird relationship story. Unlike Helen Macdonald in her exquisite and highly personal memoir, “H Is for Hawk,” Meiburg gives us the striated caracara as a way to explore natural history and to consider the work of Charles Darwin and William Henry Hudson. The latter was a Victorian-era novelist and naturalist who, like Darwin, explored South America and was fascinated by animals. Hudson sustained an intense interest in caracaras and wondered about them in a way that seems to speak to Meiburg’s soul. Hudson’s companionable presence, and some of his delightful prose, enrich this book.