Biparental care is observed in less than 10 % of mammals and are often associated to monogamous relationships or immature offspring.
When we talk about species without sexual dimorphism, we should complete the sentence with a small note: species without a sort of sexual dimorphism that we can detect.
Migrating time after time, we reached every corner of the world. Slowly at first. Then, with the invention of boats, quite fast. Today, thanks to motorised vehicles, at great speed. We are the most migratory species in the world.
Planetary geography and bird migration «Mobile organisms occupy territories with abundant resources, take advantage of them in order to breed, and leave when unfavourable conditions occur. Migration is nothing more than that» It is well known that seasonal climate alternation in mid and high latitudes of the
Question sent by LAURA RUBINAT (Tàrrega). ALBERT MASÓ answers: Well, to give an answer to that we first need to settle what we understand by «urinating». Obviously, if we limit it to the action we –and the rest of mammals– make, birds do not urinate. But we
You probably remember Steven Spielberg's 1977 film Close Encounters of the Third Kind in which, in a memorable final scene, humans communicate with aliens with music, specially with that well known "D E C C G" melody that would be later hummed by everyone.