French playwright, novelist, activist, and journalist Louis Sébastien Mercier (1740–1814) passionately captured scenes of social injustice in pre-Revolutionary Paris in his prolific oeuvre but today remains an understudied writer. In this penetrating study—the first in English devoted to Mercier in decades—Michael Mulryan explores his unpublished writings and urban chronicles, Tableau de Paris (1781–88) and Le Nouveau Paris (1798), in which he identified the city as a microcosm of national societal problems, detailed the conditions of the laboring poor, encouraged educational reform, and confronted universal social ills. Mercier’s rich writings speak powerfully to the sociopolitical problems that continue to afflict us as political leaders manipulate public debate and encourage absolutist thinking, deepening social divides. An outcast for his polemical views during his lifetime, Mercier has been called the founder of modern urban discourse, and his work a precursor to investigative journalism. This sensitive study returns him to his rightful place among Enlightenment thinkers.

In a Panamanian pond, male túngara frogs (Physalaemus pustulosus) gather in choruses, giving their "advertisement" call to the females that move among them. If a female chooses to make physical contact with a male, he will clasp her and eventually fertilize her eggs. But in vying for the females, the males whose calls are most attractive may also attract the interest of another creature: the fringe-lipped bat, a frog eater.

In TheTúngara Frog, the most detailed and informative single study available of frogs and their reproductive behavior, Michael J. Ryan demonstrates the interplay of sexual and natural selection. Using techniques from ethology, behavioral ecology, sensory physiology, physiological ecology, and theoretical population genetics in his research, Ryan shows that large males with low-frequency calls mate most successfully. He examines in detail a number of explanations for the females' preferences, and he considers possible evolutionary forces leading to the males' success.

Though certain vocalizations allow males to obtain mates and thus should be favored by sexual selection, this study highlights two important costs of such sexual displays: the frogs expand considerable energy in their mating calls, and they advertise their whereabouts to predators. Ryan considers in detail how predators, especially the frige-lipped bat (Trachops cirrhosus), affect the evolution of the túngara frog's calls.