Wildebeest migration has shrunk by 90% in Kenya's Maasai Mara due to fences being built, reveals new research. The annual spectacle - a magnet for eco tourists - has seen a "dramatic" decline over the ...

Why monarchs need help in the first place Monarchs aren’t just nice to look at. They also lead miraculous, almost improbable, lives. Like many birds, whales, and caribou, monarchs migrate. Each fall, ...