The dinosaur lineage that evolved into birds shrank in body size continuously for 50 million years. From left to right are: the ancestral neotheropod (~220 Million years old), the ancestral tetanuran (~200 million years old), the ancestral coelurosaur (~175 million years old), the ancestral paravian (~165 million years old), and Archaeopteryx (150 million years old). Leer más.
 | Hace un tiempo nos desplazamos hasta una gran alberca situada en el término municipal de Íllora, con una buena población de gallipato (Pleurodeles waltl), para comprobar si las tortugas que habían sido avistadas por un colaborador de la asociación, eran autóctonas o alóctonas, a fin de sacarlas del lugar en este último caso. Leer más. |
Gartersnakes eat newts. I mentioned this remarkable fact in my article on the Scientific American Guest Blog, but it’s interesting enough to warrant a more detailed treatment. In 1990, Edmund D. Brodie III and his father, Edmund D. Brodie Jr, published a paper in the journal Evolution that provided the first evidence of a pair of species in a highly coupled arms race. Leer más.
