TI-IK OLD BIRDS ARE EXCEEDINGLY CLEANLY 



They often wash their bills in the margin of the lake after delivering a meal. (Immature 

 gull in foreground enjoying the remnants of a dainty morselj 



Photob by Howard H. Cleaves 

 BLACK-BACK PREENING RUMP EEATHERS, OR POSSIBLY REACHING FOR OIL SAC 



