by Gemma Reguera — In his sec­ond ex­pe­di­tion to South Amer­ica, Dar­win dis­cov­ered many new species of an­i­mals and plants. The field ob­ser­va­tions ob­tained through­out this 5‑year ex­pe­di­tion pro­vided the in­tel­lec­tual frame­work for the mat­u­ra­tion of his ideas on evo­lu­tion. It also in­tro­duced the world to...