An evening walk

I walk most evenings with my Lab.  But I love it most when I can get to walk just as dusk is falling (if the weather is fine). 
Early in the evening, just as the sun is setting, a birds fly to their nests.  A few are out trying to catch early evening insects.  But as the light slowly fades, the birds disappear and the bats come out.  These early evening bats are tiny, with wingspans appearing to be not more than a few inches.  With the dusk deepening, come even larger bats, the average size ones. Finally, when all the light has faded out and the sky is darkening, come the huge  fruit bats.  As I watch them wheeling overhead, they remind me of the Batman silhouette :-)  Their appearance heralds the beginning of night.  Soon there are occasional owl hoots to be heard and I head back home.