Where will you find Halibut Jackson

My son loves the idea of camouflage, he talks about animals in habitats and himself.  The all famous hide and seek -- peek a boo--- .  So here comes a lad, Halibut Jackson, who is shy and beautiful who hides in many places, even the library.  Try and find him at your library.   I hope to stumble upon a copy at our local good will for keeps.