National Geographic’s 2019 Travel Photo Contest has been running since March 18, and will continue to accept submissions until May 3, 2019 at noon Eastern Standard Time. Each week, the publication has been unveiling a selection of entries received the previous week. Images from week four include a split-shot capture of an adolescent humpback whale, a candid moment of a mother loon feeding her chicks, and squiggles of headlamp-sporting skiers careening down the French Alps. More