The search for lost species, not a quixotic as it seems, absorbs Scott Weidensaul (Living on the Wind) in this unexpected series of encounters on the trail of beasts as varied as the Ivory-billed Woodpecker, coelacanth, Cone-billed Tanager and the Loch Ness monster. Weidensaul presents his triumphs and diappointments with wit and considerable insight into evolution and ecology.  (CON24, $16.00)