Table 1.

Site husbandry, flock size and a summary of the number of birds observed for the three sampled sites

Site name	Flock size	Husbandry type	Observation periodsa	Species detectedb	Birds observedc	Families detectedd	Exposed speciese	Per cent of birds exposedf (%)
Site S	n = 9	Cooped	20	56	706	22	12	21.4
Site L	n = 15	Free-range	20	46	353	20	8	17.4
Site C	n = 0	Control	20	52	535	23	10	19.2

^aThe number of observation periods refers to the number of 1 h systematic observations performed at each site throughout the field season.

^bSpecies detected refers to the total number of species detected at each site over the course of the field season.

^cBirds observed refers to the total number of individual birds observed at each site over the course of the field season, for all distance classes.

^dFamilies detected refers to the number of families detected at each site, otherwise known as species richness.

^eExposed species indicates the total number of high-risk species out of the 14 indicated that detected in D1 and D2, at that site, over the field season.

^fPer cent of species exposed indicates the percentage of the total birds detected at each site, that fell into the high-risk species category, and were detected in D1 and D2.