One thing I particularly enjoy about observing garden birds, is witnessing behaviour I've never seen before.
Even better, is when the experts say that a certain kind of bird always does this, but you see one doing the opposite.
When I was a kid, the natural world was expressed in very simple terms. The Lion was the king of the African jungle.
But thanks to hours of observation and filming, often under very difficult conditions, we now know that hyaenas and even buffalo sometimes get the better of lions. And that the largest African animal (the elephant) has to run away from one of the smallest creatures (the bee).