Harry on the Rocks [signed] [first edition]

An afternoon boating excursion goes terribly awry when Harry drops his oars and the tide takes him and his little yellow boat out to sea. A storm washes him ashore on an island with nothing but sand and rocks and one windblown tree. Hungry, Harry hopes to eat an egg he finds amid the rocks, but after warming in the sun, the egg doesn’t cook—it hatches! So instead of dinner, Harry finds a friend. But just what is the little, quickly growing, colorful, winged, lizardlike creature? Harry’s in for more than one surprise as he discovers the true nature of the bizzard’s identity and the friendship they share.