COCKATOOS

Weary of hearing the same greeting day after day—``Good morning, my fine feathered friends!''—Professor Dupont's ten cockatoos fly the coop. He searches every room of his elaborate, old house without spotting them—but readers will, for they're all there, slightly concealed. Blake's illustrations are, as ever, funny and filled with lively detail; but while this doubles as a counting book, it's as airy and weightless as a feather. (Picture book. 5-7)