'Perhaps imitating gorillas, grouses beat these in front of their chests to warn intruders'
Wings
BIRDS DO IT: Perhaps imitating gorillas, grouses beat these in front of their chests to warn intruders
Perhaps imitating gorillas, grouses beat these in front of their chests to warn intruders
Perhaps imitating gorillas, grouses beat these in front of their chests to warn intruders
BIRDS DO IT
Wings
BIRDS DO IT