Despite being intended mainly for artistic purposes or for personal use (portraits and travel diaries, etc.), photography soon became a valuable ally of science.

Understanding what separates us from the rest of the animal kingdom is an old obsession of ours. The most frequent attribute we rely on to justify our supposed superiority is intelligence. Yet, how are we to compare the intelligence of species as different as humans, octopi or dolphins?

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.