Poisonous many may be, but scientists had yet to discover a species of frog that is venomous. That is, one that not only produces toxic substances, but also possesses a means to deliver them to another organism as a defense mechanism. Finally, a new discovery has put not just one venomous species on scientists’ radars, but two. Both residing in Brazil, these frogs are adorned with bony spines that pierce the skin where their venom concentrates, effectively turning their heads into dangerous weapons. Leer más.