Many dinosaurs used calls to communicate, just like birds today.
One of the best times to hear bird calls is first thing in the morning in spring and early summer. All kinds of songbirds sing together, and this symphony of bird calls is called the dawn chorus.
The first birds pipe up about an hour before sunrise, but the songs carry on into the morning - so don't worry if you're hoping for a few extra minutes in bed!
Why not pack a breakfast and head to the park?
To hear an example of such a symphony, the BBC got out of bed at the crack of dawn to make this recording.
You can read more about the dawn chorus at the Royal Society for the Protection of Birds (RSBP) website.