2 | President’s Page
Refining economic arguments for a cleaner environment.
By Doug Thomas

6 | Earth Watch
Constance Creek: a case study in wetlands loss; protecting the Missinaibi; Matchedash Bay: fooling with mother nature; escarpment becomes biosphere reserve; victory on the Rouge Valley; joint management agreement for Temagami forests; Polar Bear Park management plan up for review; looking at water management structures.

14 | Around Ontario
Green-ups unearth unusual items; help with herons.

41 | Notes
Wetlands program; staff profile—Judy Eising: finding the money to do the job.

44 | Birder’s Notebook
Turkey vultures: ode to an oak tree.
By Kent A. Prior

46 | Groundswell
Wetlands destruction: stop it now.
By Marion Strebig


16 | Bullfrog Blues
The bullfrog’s booming jug-o’-rum is becoming a rare melody. We talk to naturalists and herpetologists to find out why.
By Suzanne Kingsmill

On the cover
20 | Talking Wings
A butterfly’s wings are more than just a key to identification. Here’s what wings can tell you about a butterfly’s life.
By Phil Schappert

26 | Keeping it Whole
Development threatens to rip apart the Oak Ridges Moraine, nature’s water-control centre for southcentral Ontario.
By Brad Cundiff

31 | Zebra Mussels
We’ve lost the battle against this exotic’s invasion of the Great Lakes. Have we learned anything from our mistakes?
By Peter Reschke

ON Nature Magazine Summer 1990 cover

ON Nature magazine is an award-winning quarterly that brings readers closer to nature by exploring Ontario’s natural species and spaces, and providing insight on pressing conservation issues.

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Photos © John Powell, Donald Gun, Pam E. Hickman and Bill Ivy