"Ken Ward in the Jungle" by Zane Grey is a novel written in the early 20th century. The story follows Ken Ward, a young forester and aspiring explorer, as he embarks on an adventurous journey into the jungle of Mexico with his younger brother Hal. Their quest revolves around exploring the Santa Rosa River, with hopes of conducting naturalist fieldwork that might lead them to a future expedition in Africa. At the start of the narrative, Ken and Hal are on a train journey from the Arizona desert to the lush jungles of Mexico, eagerly anticipating the adventures that await them. Ken, motivated by a longing for exploration and the approval of his uncle, feels a profound curiosity about the untamed wilderness they are entering. The opening portion introduces the excitement of the boys upon reaching their destination, their interactions with local people, and Ken's desire to map the mysterious river. As they prepare for their expedition into the jungle, the narrative sets the stage for the challenges and discoveries they will encounter along the Santa Rosa River. (This is an automatically generated summary.)