After analyzing the 75-million-year-old remains of a raptor couple likely killed in sand dune collapse, a Canadian paleontologist has discovered dramatic physical differences between the two, a possible sign of sexual dimorphism in the species, and further evidence that these dinos partook in elaborate mating rituals.
Those weird bone eating worms just got weirder. A newly discovered species of Osedax worms — those incredibly cool and strange creatures that feed off whale bones — appears to be evolving in reverse. Males of the species have reverted to an earlier form, which is surprising because these genes should have…
In nature, it usually pays to pack on the pounds, especially if you're male and competing for a female. But a treasure of a paper explains why male anacondas have to fight for their ladies while staying small.
Well-preserved fossils of pterosaurs are extremely hard to come by, which makes this recent find of 40 male and female individuals all the more incredible. Along with the discovery of a spectacular new crested species, paleontologists have also found the first 3-dimensional fossilized pterosaur eggs.
Brain size can vary tremendously between species. For instance, the average human head holds around three pounds of cerebral matter; your typical chimp, on the other hand, packs about a third of that.
China's concave-eared frogs are one of two amphibians that use ultrasonic frequencies to communicate. There's only one small problem: the males and the females have evolved along such vastly separate lines that females are completely deaf to the males' ultrasonic cries.