Winner of the Association of American Publishers PROSE Award for Excellence in Biological and Life Sciences
A world-renowned researcher of animal behavior reveals the extraordinary orienteering skills of desert ants, offering a thrilling account of the sophisticated ways insects function in their natural environments.
Cataglyphis desert ants are agile ultrarunners who can tolerate near-lethal temperatures when they forage in the hot midday sun. But it is their remarkable navigational abilities that make these ants so fascinating to study. Whether in the Sahara or its ecological equivalents in the Namib Desert and Australian Outback, the Cataglyphis navigators can set out foraging across vast expanses of desert terrain in search of prey, and then find the shortest way home. For almost half a century, Rüdiger Wehner and his collaborators have devised elegant experiments to unmask how they do it.
Through a lively and lucid narrative, Desert Navigator offers a firsthand look at the extraordinary navigational skills of these charismatic desert dwellers and the experiments that revealed how they strategize and solve complex problems. Wehner and his team discovered that these insect navigators use visual cues in the sky that humans are unable to see, the Earth’s magnetic field, wind direction, a step counter, and panoramic “snapshots” of landmarks, among other resources. The ants combine all of this information to steer an optimal course. At any given time during their long journey, they know exactly where to go. It is no wonder these nimble and versatile creatures have become models in the study of animal navigation.
Desert Navigator brings to light the marvelous capacity and complexity found in these remarkable insects and shows us how mini brains can solve mega tasks.
It has been known for more than a century that men and women tend to differ in the relative lengths of their index (2D) and ring (4D) fingers, which upon casual observation seem fairly symmetrical. Men on average have fourth digits longer than their second digits, while women typically have the opposite. Digit ratios are unique in that they are fixed before birth, while other sexually dimorphic variables are fixed after puberty, and the same genes that control for finger length also control the development of the sex organs. The 2D:4D ratio is the only prenatal sexually dimorphic trait that measurably explains conditions linking testosterone, estrogen, and human development; the study of the ratio broadens our view of human ability, talent, behavior, disposition, health, and fertility. In this book, Manning presents evidence for how 2D:4D correlates with traits ranging from sperm counts, family size, musical genius, and sporting prowess, to autism, depression, homosexuality, heart attacks, and breast cancer, traits that are all linked with early exposure to sex hormones.
Mother and infant negotiate over food; two high-status males jockey for power; female kin band together to get their way. It happens among humans and it happens among our closest living relatives in the animal kingdom, the great apes of Africa. In this eye-opening book, we see precisely how such events unfold in chimpanzees, bonobos, and gorillas: through a spontaneous, mutually choreographed dance of actions, gestures, and vocalizations in which social partners create meaning and come to understand each other.
Using dynamic systems theory, an approach employed to study human communication, Barbara King is able to demonstrate the genuine complexity of apes' social communication, and the extent to which their interactions generate meaning. As King describes, apes create meaning primarily through their body movements--and go well beyond conveying messages about food, mating, or predators. Readers come to know the captive apes she has observed, and others across Africa as well, and to understand "the process of creating social meaning."
This new perspective not only acquaints us with our closest living relatives, but informs us about a possible pathway for the evolution of language in our own species. King's theory challenges the popular idea that human language is instinctive, with rules and abilities hardwired into our brains. Rather, The Dynamic Dance suggests, language has its roots in the gestural "building up of meaning" that was present in the ancestor we shared with the great apes, and that we continue to practice to this day.
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