Optionally delay showing the answers for a few seconds

[ttencate]

It's best to try and identify the bird before looking at the four choices, so we should encourage that.

We could have a timer that shows the answers after, say, 3 seconds. If you want to answer sooner, you can tap a button to show them. Note that the button should not be in the same location on the screen as the answers, to prevent mis-taps when the answers are just appearing.