2 questions about squirrels...?

Question

Okay, question 1 is: Why do squirrels chase each other?

Question 2 is: What is that weird barking / chirping noise that they make for? Obviously, as a citizen of the planet Earth, I've seen tons of squirrels in my day. But until today, I never heard them make any noises. What are those noises for? It was 2 squirrels chasing each other and making that weird noise...

Answer 1

Their way of communicating.

Answer 2

They chase each other to play or most likely it is because another squirrel has invaded their territory. The chirping/barking sound is a type of warning it is a sound of irritation. This is my take on it, cause I hear them in my backyard all the time. They make that chirping noise only when they are mad it seems.

Answer 3

Squirrels, chase for playing.

And the chriping noises, are properly mating noises or communication...