Mudcat Café message #3847311

The Mudcat Café ^TM
Thread #161782 Message #3847311
Posted By: Steve Shaw
29-Mar-17 - 06:06 AM
Thread Name: Why do the birds 'change their voices'?
Subject: RE: Why do the birds 'change their voices'?

Robins, change their song as winter moves into spring. The winter song has been described as more mournful, but the song becomes more perky and upbeat as summer gets nearer.