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RING-BILLED GULL. (1954). I

1. Aerial Long Call Note. May 3, I.

2. Landing Call. April 27, II.

3. Aerial Moan. May 15, I. 

4. Fighting. June 17, II; June 19, VII; June 20, IV.

5. Attack Call? June 19, VII. 

6. "Defense" posture. Drawing: June 19, VII. 

7. Upright Postures. Drawings and description: April 26, III; May 1, I; June 16, V, VI; June 17, V; June 19, IV, V; June 20, V. 
Descriptions: April 25, II; May 5, II. 

8. Head-flagging. April 24, II; April 25, I. 

9. Long Call Note. June 20, I. 

10. Trumpeting Call Performance. Call: June 20, I, IV. Drawings and descriptions: April 24, I; April 26, II; May 3, I; May 5, I, II; May 8, II; June 16, I, II, III, IV; June 17, I. 

11. Head-down Posture. Alone, with Long Call Note: May 5, II. 

12. Low Oblique. Drawings and description: April 26, III; May 3, I; May 5, II; June 16, II; June 17, I, IV. 

13. Moan. Description: April 27, II; June 17, II, V, VI; June 19, II; June 20, I.  Posture on water: May 15, I.
 
14. Choking. Description: June 17, II, VI; June 19, III. In association with the Moan and regurgitation: June 17, IV. Choking in the Oblique Posture: June 19, IV.

15. Head-tossing. Accompanying postures and movements: April 24, II; April 27, II; May 5, I; May 8, II; June 16, VI. After the complex Trumpeting Call Performance: April 24, II; April 26, II. 

16. Gaping Pecks. Description: June 16, II, III, V; June 17, V, VI; June 20, I, II, V. Drawings: June 16, I, IV, V; June 19, V. 

17. "Ground Ceremony". April 25; April 26; April 27; May 8, I. 

18. "Mutual Ceremony". April 24, II, III; April 25; April 26; April 27; May 1; May 5, I; May 8, I; June 20, II. 

19. Pair-formation. Male solicited by more than one female: May 8, I. 

April 26, II

20. Redirection Attacks. April 24, II; May 5, I; June 17, II. 

Transcription Notes:
Removed formatting descriptions (e.g. [[underlined]]) as per Advanced Instructions