State wildlife officials and the Mass Audubon bird conservation group are advising residents to bring in their bird feeders and birdbaths until more is known about a mysterious avian ailment.

It is winter time and, no surprise, the weather is cold. This is not the time of year to expect to hear birds singing. But I have been hearing Carolina wrens singing just about every day this month. Not only their staccato chattering alarm call, but their boisterous, loud, whistled and usually three-syllabled song that is repeated over and over again. The song sounds something like “teakettle” or “committee.”