February 2011, Volume 214, Issue 4. Leer más.
 | Two species of invasive frog which are hopping their way through Florida probably got to the state by hitching a ride on floating debris from Cuba, according to a study published on Wednesday. Amphibian experts have long wrangled over the origins of the greenhouse frog (Eleutherodactylus planirostris) and the Cuban treefrog (Osteopilus septentrionalis). |
| Two species of invasive frog which are hopping their way through Florida probably got to the state by hitching a ride on floating debris from Cuba, according to a study published on Wednesday. Amphibian experts have long wrangled over the origins of the greenhouse frog (Eleutherodactylus planirostris) and the Cuban treefrog (Osteopilus septentrionalis). |
 | El 3 de octubre en el Venetian Casino, ubicado en Las Vegas, se llevará a cabo una de las subastas más extraordinarias: Samson, un dinosaurio de la especia favorita de todos, el Tyrannosaurus rex, podrá ser comprado por el mejor postor. Samson se supone es uno de esqueletos fósiles más completos que se hayan encontrado, de hecho solo hay tres T-Rex que presumen eso. Este espécimen mide aproximadamente 12.2 metros de largo y 5.5 metros de altura y se calculó vivió hace 66 millones de años en lo que hoy es Buffalo, Estados Unidos. Los restos fósiles se prepararon en el Museo de Historia Natural Carnegie de la ciudad de Pittsburgh e incluye 22 dientes completos y 170 huesos -que es más de la mitad de lo que hubiera tenido un dinosaurio de esta especie-. El precio en el que estiman vender a Samson fluctúa entre los 2 y 8 millones de dólares. |
The herbivorous sauropod dinosaurs of the Jurassic and Cretaceous periods were the largest terrestrial animals ever, surpassing the largest herbivorous mammals by an order of magnitude in body mass. Several evolutionary lineages among Sauropoda produced giants with body masses in excess of 50 metric tonnes by conservative estimates. With body mass increase driven by the selective advantages of large body size, animal lineages will increase in body size until they reach the limit determined by the interplay of bauplan, biology, and resource availability. There is no evidence, however, that resource availability and global physicochemical parameters were different enough in the Mesozoic to have led to sauropod gigantism. Leer más.
