Dead parrots

I saw this dead bird today - it must have grabbed onto the brick just before it died.

Since birds have a pulse of about a million heartbeats per minute, I would think that a majority would die from heart attacks when flying. It ought to be raining dead birds but I've never seen a single bird drop dead from the sky - so I'm wondering where and how birds die.

I could google this, but I kind of want it to remain a mystery. Like breasts.