As summer progresses, more sporadic and less musical calls echo around the hills as adult birds use their voice to keep control over their fledgelings.

If he stays fit, we can expect him to crank through the gears as the summer progresses.

The leaves can become a flaming red as summer progresses.

But remember that the leaves fade as the summer progresses, so it's a good idea to have something behind them to spill forward and cover their space.

Larvae and adults are sensitive to shorter daylengths as the summer progresses that signal the coming of winter and induce diapause.