Universal Wide Wing & Tail Ruler (15cm, 30cm, 60cm) vacutainer ABOUT THE SIBLEY FIELD GUIDE

ABOUT THE SIBLEY FIELD GUIDE TO BIRDS OF EASTERN NORTH AMERICA

What we’ve learned of these key migrations―how billions of birds circumnavigate the globe

6 | ISBN 0393608905

enabling high catch efficiency when properly installed in high-traffic areas

Universal Wide Wing & Tail Ruler (15cm, 30cm, 60cm) vacutainer ABOUT THE SIBLEY FIELD GUIDEOur wing rules are made from sturdy stainless steel with a universal wide stop that extend past the width of the rule. All sizes are 1" wide, the stops are 1 1 2" wide. Rule is double sided with numbers in descending order on opposite to allow for tail measurements. Available in Small (15cm), Medium (30cm), and Large (60cm).