For the last three months, the collies and I have grown accustomed to hearing the song of the wood thrush during our sunrise walks: one bird here, one bird there, each singing from his own leafy perch. I love them so, and I think the collies do too. But in the last week, the wood thrush song has ceased. The birds’ attention now turns to other matters. Before long they will depart for warmer places. I already miss them, and I think the collies do too. So when we got back this morning, I found a wood thrush video on the internet and played it. The collies barked for joy, and I think I did too.