Excellent natural history essays, 29 of them, not excessively technical, although the author provides a Partial Sources section so you can find more technical information if you want. Several essays comment on the differences between island ecologies and mainland ecology, and others examine peculiarities of the desert environment.
Delos - reviewed The Flight of the Iguana : A Sidelong View of Science and Nature on
My favorite science writer. I actually can't imagine anyone being better at making what could be tedious essays scientific research into interesting, entertaining, and often humorous stories. It's been years since I read it, but this is a collection of short stories, mostly classified as nature writing, that came from articles he published in various magazines. His other short story collections are Wild Thoughts from Wild Places and The Boilerplate Rhino. See also his longer works The Song of the Dodo and Monster of God.