When Charles Darwin first discovered the Galapagos Tortoises, he tried to ride them

"...After considerable explorations in South America, the Beagle reached the Galapagos Islands in September 1835. Darwin was fascinated by such oddities as volcanic rocks and giant tortoises. He later wrote about approaching tortoises, which would retreat into their shells. The young scientist would then climb on top, and attempt to ride the large reptile when it began moving again. He recalled that it was difficult to keep his balance..."