and captured but not eating). Incredible that the refugia were catching so many while the traps caught only 1 ! 20FT.7 With Sallupin and Carol to peregrine in the Delta, arrived at a.m.. 24 hawks perched or flying over the area, plus 1 marsh hawk and 1 barn owl. Saw traps with Arnez + gim Lynch = a few minutes. 20FT.13-14 To Zogelen Creek with Kopods to see Fitzgerald meadows area. Arrived 1 p.m., stayed overnight, apt room. Night clear, 20°F, light frost with heavy crystalline frost on the grass above each open meadow burrow. This mead country often becomes very easy and reveals many that would have been missed. There were hundreds on this grid where (oo ?) traps caught only 1 mink and 1 Pero, so it must not reflect occupied burrows only. There are considerable differences in mouse densities in different meadows, and striking differences in composition & density of cover of different parts of the same meadow (due to soil ?, drainage ?, spring flooding ? etc.). With such a short growing season, a week or two difference in snow melt or drainage in the spring can make a big diff in production and even species composition. This has been a very dry summer. Did fresh beaver cuttings at home at one of Dave Taylor's sites. They have cut almost every aspen for hundreds of yards of stream. They catch on relatively little.