I've just heard that Sebastian has been receiving quite a few emails recently. Lots of people writing about the changing seasons. Why not try Sebastian's Waddle, it's a good introduction for talking about changes in the Spring and also encouraging children to go outside and look for signs.
(Neat trick: why not look in the bottom RHS of your browser window and zoom in to make the book even larger).
There's also the Sebastian's Search resource with three types of searches.
(Along the lines of Research, see also the Rivers Keyword Search for KS2).
:) James and Jo Rickards