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RING-BILLED GULL. (1954). II

21. Regurgitation and Feeding.  May 7, I; June 17, II.
 
22. Copulation. General: June 16, V. Unsuccessful attempt: May 7, I. Call: April 26, IV; June 17, VI. 

23. Post-copulatory patterns.  Upright and Head-flagging: April 26, IV. 

24. Feeding of chicks.  With Moan: June 19, VIII. Without Moan: June 17, II, III, IV; June 19, I. Feeding strange chick: June 19, IV.

25. Hostility toward chick. June 19, III, VI, VII. Redirected: June 19, V. 

26.  Crouch. June 19, III.