Before dinosaurs ruled the Earth, they had some enormous relatives who ruled over them. Sterling Nesbitt talks about these giants of the past and catches us up on the latest in dinosaur news. Plus: Tree rings don’t just show the age of a tree, they also tell us about the past and, maybe the future. According to Stockton Maxwell, tree rings might even help solve climate change.

Later in the show: Some say monarchs are the most beautiful of all butterflies. But they could end up on the endangered species list. Tatyana Lobova is part of a national effort to rescue the beautiful creatures by planting the milkweed plants they need for survival. Plus: It’s hard to have a conversation in a noisy room, so how do birds get their messages across in highly urbanized areas? David Luther Mason says bird songs and changing and the beaks of city birds are actually growing longer! And: For a full month, students enrolled in the Wilderness Institute eat, breathe, and sleep their course. The ultimate test of their leadership and wilderness skills comes when their professor Anja Whittington leaves them to experience the final expedition on their own.