INSTINCT AND INTELLIGENCE IN BIRDS 125 

Fic. 24. HtGt BORING OF PILEATED WOODPECKER in a white pine two feet in 
diameter, to reach galleries of the carpenter ants, seven feet from the ground, where 
the insect gained entrance; illustrating either instinct to follow sounds, or intelligence 
in adapting means to end. 

Fic, 25. SounD PINE CHIPS FROM WORKSHOP OF PILEATED WoopPECKrR, shown 
in Fig 24; some are bent or broken with the wrenching stroke of the bill. 
‘ Nat= 
ural size. 
