How do animals sleep? A journey into their fascinating world of dreams

How do animals sleep? A journey into their fascinating world of dreams

Humans need to sleep a certain amount of hours every day, which can vary depending on the age: adults need an average of 7-8 hours per night. Sleep allows us recovering the energies we lost throughout the day, and makes our organism work better, favouring concentration and coordination. Sleeping habits vary from animal to animal: every

The disappearance of the monarch butterfly

The disappearance of the monarch butterfly

The number of monarch butterflies that have migrated from the United States to the forest covered peaks of the Sierra Madre in Mexico has continued to decline this year. In December 2013 only 35 million individuals of the most popular butterfly in the whole of North America migrated, coming to inhabit 6,700 square metres of