The idea that ducks’ quacks do not echo is not a new one, but it has been discredited by modern researchers. Experiments in which ducks were encouraged to quack in enclosed areas have resulted in echo recordings. The origin of this misconception is not entirely clear, although it is assumed that because ducks normally do not quack very loudly, the resulting echo would be difficult for many humans to hear
The southern ground hornbill is not only a carnivorous bird, it also is a very loud one. These birds’ calls are sometimes even confused with lions’ roars, and group calls can be heard from about 1.8 miles (3 km) away. A hornbill’s upper beak includes a feature known as a casque, a structure that can contribute to the sound and quality of its call
According to researchers, people from Great Britain have invaded 90% of all countries at some point in time. In fact, only 22 current countries have never been invaded by Great Britain, including Luxembourg, Mali and Sweden. Not all of these invasions were by Britain’s military.
Kazakhstan produces 35% of the world’s supply of uranium and is home to 15% of the Earth’s total uranium resources. Interestingly, Kazakhstan did not have any nuclear plants of its own as of 2012, although it was in the process of developing a nuclear program.