Beresford and the Baboons (1919)

Beresford, the son of the Earl of Swank, is lost on a desert island as a boy. There he is found by a tribe of baboons and raised as one of them. They teach him the lore of the jungle: mining engineering, stud poker, and hem-stitching. Eventually however he is discovered by an expedition which includes a young lady with whom he falls in love.