Sorry to bother you with this, but I was unable to find this info on your website.
Yes, it is legal--details are copied below from the Upland Game Rules Book:
All birds in Idaho are protected except starlings, Eurasian-collared doves, English sparrows and feral pigeons.
Protected nongame birds cannot be hunted, taken or possessed (including parts of birds, even if found dead). All hawks, owls, eagles and vultures are protected. Game birds may be taken only in accordance with established hunting rules.
Protected Nongame Wildlife, Species of Special Concern, Threatened or Endangered Species, Protected Birds
Special classifications for some animals extend extra protection to those species. These animals cannot be hunted, taken or possessed. Threatened or endangered wildlife include caribou, Canada lynx, grizzly bear, and Northern
Idaho ground squirrel. Protected nongame wildlife include red (pine) squirrel, wolverine, chipmunks, rock squirrel, Wyoming ground squirrel (nevadensis subspecies only), golden-mantled ground squirrel, Merriam’s ground
squirrel, Piute ground squirrel, pika, kit fox, northern flying squirrel, bats, Southern Idaho ground squirrel and migratory song birds.