An increasing number of men suffer from fertility problems, especially in western society. The general belief is that many problems may be related to stress but it is possible that some of them may arise because men simply have intercourse too infrequently. This is the intriguing implication of recent research at the University of Veterinary Medicine, Vienna, that has just been published in the international online journal PLoS ONE. Leer más.

Various lineages of amniotes display keratinized skin appendages (feathers, hairs, and scales) that differentiate in the embryo from genetically controlled developmental units whose spatial organization is patterned by reaction-diffusion mechanisms (RDM). Leer más.

The dawn of the dinosaur era was thought to start around 230 million years ago, but a new discovery moves their origin 15 million years further back in time. Leer más.

El nuevo Área de Reptiles del Zoo ya está inaugurado, ampliando la oferta lúdica y formativa del mismo. La delegada de Medio Ambiente, Felisa Rosado, acompañada por la delegada de Educación y Juventud, Lidia Menacho; el director del Zoobotánico Jerez, Jose María Aguilar; el representante de la empresa Exotic Jerez y el gerente del Centro Educativo Jerez, Francisco Javier Calvo, inauguraron ayer las instalaciones, que hoy ya pueden disfrutar todos los visitantes  del parque. Leer más.

The rise of dinosaurs was a major event in vertebrate history, but the timing of the origin and early diversification of the group remain poorly constrained. Here, we describe Nyasasaurus parringtoni gen. et sp. nov., which is identified as either the earliest known member of, or the sister–taxon to, Dinosauria. Leer más.