galapagos giant tortoise, chelonoidis nigra eating grass. it is the largest living species of tortoise. it has large brown bony

animal big bony brown chelonoidis coldblooded cryptodira cute darwin domed ectothermic ecuador endangered endemic environment evolution exotic extinction fauna galapagos galpagos geochelone giant grass herbivores huge island islands large mammal natural nature nigra outdoor pattern reptile reserve shaped shell slow species testudines testudinidae tortoise tropical turtle walk wild wilderness wildlife