Once critically endangered, the Azores bullfinch is showing signs of recovery. Two decades of habitat restoration has brought back the bird's numbers.
Scientists use artificial intelligence to study animal communication. AI can help identify the meaning and context of animal sounds. Project CETI uses AI and underwater technology to study sperm whale communication.
Miraculous comeback of harlequin frogs offers hope for other "extinct" species. Scientists discover the resurgence of species previously thought to be lost forever.