Rock pools - book (1 Viewer)

I take the kids to look into rock poools while I do some sea watching in S W Scotland. The kids (aged 4, 5 and 6) are very interested in what they see so I am after a book that shows what is what in these pools. At there age it needn't be too serious, but again, not too basic. I only seem to have seen the two extremes. Anyone got any recommendations?

al

The Collins Book of the Seashore of Britian & Northern Europe. Hayward, Smith & sheilds

Collins also do the 'Collins Gem Book of the Seashore', a great series of books and small enough to fit in your pocket (priced £4.99 usually).
There's also the 'Michelin I-Spy on the Seashore', a kind of 'tick list' for kids where they earn points for ticking off the things that they've seen. Once completed, you can also send off for a free I-Spy badge. These books (and there's a whole range of them) can usually be bought for £1.99.