if you have a frog as a centerpiece on your kitchen table. And if your trifle bowl spends more time holding wildlife than trifle.
Andrew found a frog in one of the buckets that we use to collect rain water. We observed it for a while, looked up frogs in the Handbook of Nature Study and discovered that he (or she) was a Southern Leopard Frog. The boys made some very good observations and drew them in their nature notebooks. I was very impressed. Their observation skills as well as their drawing skills have improved quite a bit over the last year.
We kept the frog inside for an hour or so while we enjoyed watching him and then took him outside and let him hop away. It was a nice, impromptu nature study.