Vicki and other Tweets,
As a wildlife bio who spends about 90+% of his research in the shrub-steppe I can weigh in here. I couldn't tell from your message if you are looking for a complete list for the shrub-steppe of the Columbia Basin (E WA) or for Moses Coulee. Mammals and reptiles are likely doable for both, I will give suggestions for each in just a second, insects... oh boy... if you are talking about a complete insect inventory it is probably hard to get for Moses Coulee and not even sure if one exist in full form for E WA in the shrub-steppe. I am not an insect person (though do enjoy looking at butters) and even for Moses Coulee will likely total in the hundreds if you are talking about all insects, for the shrub-steppe of WA it is likely much higher.

For the entire shrub-steppe of E WA there is a great on-line resource (actually its great for all of WA) in the UW NatureMapping website. You can find ranges and associated habitats for birds, mammals and herps (reptiles and amphibians) for all species in WA and CA based on records and GAP analysis of habitats. http://depts.washington.edu/natmap/maps/

For reptiles you are probably dealing with about a dozen species of reptile in the shrub-steppe of WA including snakes, lizards and skink. Mammals, most of these will be in the form of small mammals, like shrews and bats.

For Moses Coulee there are two potential sources of information. The BLM and Nature Conservancy plus WDFW manage lands in this portion and all three have done quite a bit of work in terms of biological diversity, especially some Bat inventories from the BLM. If you want to reply off list I'd be happy to steer you in the direction of email contacts I have.

Hope this helps. As I've really began to understand the Shrub-steppe over the past 7 years (the main habitat I've worked in for the past seven years) I'd be glad to help answer questions if you have some additional ones. Its a really wonderful and underappreciated habitat!

Scott Downes
downess at charter.net
Yakima WA