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Females of the neotropical mantis Acanthops falcata adopt a special posture at dawn which is maintained for about 20 minutes. During the same period, males fly strongly, even in the absence of females. Our studies show that in this posture females are secreting a pheromone that acts as a sex attractant. All sexual activity in this species normally occurs(More)
Groups of Achaearanea wau (Theridiidae) disperse and found new colonies by means of synchronized emigrations of adult and subadult females. Emigrations involve the construction of silk highways from parent colonies to new web sites, synchronized migrations along the highways, and the establishment of daughter colonies. Emigrations of Achaearanea wau are(More)
There is an ever-increasing amount of digital content being generated that needs to be well-organised, preserved and made accessible. The majority of generic repository software tools that currently exist are, arguably, overly complex, thus making collections difficult to manage and maintain in resource constrained environments. A possible solution to this(More)
The movements of the intestinal villi in living animals were first described by Gruby and Delafond (1). Since the appearance of their report in 1843, contributions to this subject have appeared sporadically. Among those dealing to a large extent with the movements of the villi and giving little or no consideration to the activities of larger masses of the(More)
Homo sapiens as 1 species out of millions consume 40% of the primary products of the earth. The domestication of plants and animals produced significant change in how we survived as a species. It ultimately led to civilization, cities, the division of labor, and population growth. Presently we face a paradox between controlling the development of(More)