The selective forces imposed by primary receivers and unintended eavesdroppers of animal signals often act in opposite directions, constraining the development of conspicuous coloration. Because iridescent colours change their chromatic properties with viewer angle, iridescence offers a potential mechanism to relax this trade-off when the relevant observers involved in the evolution of signal design adopt different viewer geometries. Leer más.
Variation in morphological characters were investigated among 126 specimens from at least 67 populations covering the whole range of the large pitviper currently known as Trimeresurus sumatranus (Raffles, 1822). Leer más.
The beginning of June always holds a nice fieldtrip in store for us in one of the most beautiful parts of the Netherlands – Drenthe. This area is patch work of heath lands, grasslands, swamps and beautiful woodlands. – Leer más.
Call it the Jimmy Durante of dinosaurs — a newly discovered hadrosaur with a truly distinctive nasal profile. The new dinosaur, named Rhinorex condrupus by paleontologists, lived in what is now Utah approximately 75 million years ago during the Late Cretaceous period. Leer más.
We found a unique, burrow-utilising dicroglossid frog of the genus Limnonectes from western Sarawak, East Malaysia. This frog is always found near burrows on the ground, into which it escapes when disturbed. It is much divergent from other congeners in morphology and mtDNA sequences. Leer más.
