Read the text below and fill in the gaps with the words that best fit each gap

Bat Chat

Did you know that in [ ] bat-cave you could find [ ] many as 20 million bats? In spite [ ] their extraordinary numbers, bats miraculously never fly [ ] each other!

How is this possible? Bats emit ultrasonic sounds [ ] bounce back to themselves, allowing them to judge the size and distance of objects. [ ] short, they use their ears to "see"! Bats can achieve this with [ ] incredible accuracy that they can even detect a tiny ant on the ground! Not [ ] that, but they also use their voices to sing like birds! Yet, unlike birds, bats sing in mostly ultrasonic frequencies that are usually [ ] high for humans to hear. In fact, bats have some of the most intricate communication systems in the animal kingdom. They actually use their songs to talk to each other, and have [ ] found to have distinctive vocal patterns, just [ ] humans. Indeed, scientists [ ] so amazed by bats, they believe that by studying bat language, they could provide better treatment [ ] human speech disorders.