Southern cassowary: The giant prehistoric bird with dinosaur feet; Kākāpō: The chonky parrot that can live almost 100 years; ... acidic substance that can sting a predator's eyes and skin.

These scavenger birds have an unexpected way of keeping their predators away ... with wingspans reaching around 5.5 feet (1.7 meters ... acidic substance that can sting a predator's eyes and skin.

Despite their large size — with wingspans reaching around 5.5 feet (1.7 meters) — they're also preyed upon by other birds, including eagles, owls and hawks. But these vultures have a nifty ...