The eaglets still rely on mom and dad for food, but not for long. Friends of Big Bear Valley Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. The newest residents of the internet’s favorite eagle nest are rapidly growing right before our eyes. Nearly one month after hatching, Jackie and Shadow’s two to-be-named chicks are beginning to put more on thermal fur. This extra warmth was certainly helpful, after a snowstorm covered their nest in snow over the weekend. What a difference three weeks makes. Image: Friends of Big Bear Valley. According to nonprofit Friends of Big Bear Valley (FOBBV), the chicks are also growing their first juvenile pin feathers . These spiky feathers on the wing’s tips are essential for flight. They will continue to grow until the chicks fledge about 10 to 14 weeks after birth. The eaglets’ pin feathers are starting to appear.…