TABLE I.

Bullfrog advertisement calls collected during 1994 and 2003 by date and site. The number of calls, number of calls with modulations (mods), and number of one-note calls are indicated for each recording session. More than 80% of the modulated calls conform to the two patterns identified.

				% Conformation to pattern		One-note calls
Date	Site no.	Total calls	Calls with mods	“begins with 1 mod”	“+ or − 1 mod”	Total	% with mods
7/02/94	1	406	155	87.1	99.9	196	0
7/02/94	1	307	116	92.2	98.3	165	0
7/03/94	1	299	137	92.0	99.3	123	0
7/08/94	1	290	171	81.9	91.2	165	0
6/24/03	1	249	67	94.0	100	28	0
6/25/03	1	505	245	89.4	98.0	71	0
6/26/03	1	495	228	92.6	98.7	32	0
6/27/03	1	435	180	85.6	94.4	105	0
6/28/03	1	280	102	92.2	96.1	92	0
6/29/03	2	321	232	96.1	97.4	15	0
6/30/03	2	335	231	99.1	99.6	30	0
7/06/03	1	562	230	89.6	98.3	127	0
7/07/03	1	366	142	86.6	97.2	96	0
7/08/03	2	184	81	93.8	98.8	36	0
7/10/03	3	116	58	100	96.6	30	0
7/13/03	1	254	89	85.4	93.3	84	0
7/14/03	3	163	72	97.2	100	60	0