9. Ravens can mimic human sounds: captive ravens become quite talkative. Even better than parrots at mimicking human speech. They can also mimic sounds like car engines, toilet flushes. While wild ravens imitate the sounds of wolves and foxes to help them prey open the animal carcasses they can’t.
10. Swiftlets nests are a delicacy: Some Swiftlets build their nests exclusively from their hardened saliva, which is considered a delicacy especially in China where bird nest soup is made from it. It is one of the world’s most costly delicacies despite having no nutritional value and having little taste.