Claim: Theodore Roosevelt was a naturalist advocate throughout his life.
Evidence: Theodore Roosevelt Jr. -LRB- -LSB- ˈroʊzəvɛlt -RSB- ; October 27 , 1858 -- January 6 , 1919 -RRB- was an American statesman , author , explorer , soldier , naturalist , and reformer who served as the 26th President of the United States from 1901 to 1909.