D2 Rings Field Guides 30 contributors—from young birdwatchers to

30 contributors—from young birdwatchers to professional ornithologists—explain why and how they are shifting to climate-friendlier approaches

3 mm inside diameter

C-permit holders: please ask for the rings to be issued in your Trainer's name or Ringing Group name and not your own

In this timely book

D2 Rings Field Guides 30 contributors—from young birdwatchers to** Please use the drop down menu above to select the quantity of rings that you require** 5. 25 mm inside diameter Incoloy (hard) metal rings. This product will only be sold and shipped to appropriately licensed BTO ringing permit holders. C permit holders: please ask for the rings to be issued in your Trainer's name or Ringing Group name and not your own. Please ask your Trainer to email sales@bto. org in order to authorise the order.