Table 1. Annual sample size for tracking of macaroni penguins at Bird Island, South Georgia, with local krill densities (coefficient of variance), 2001–2005.

Year	TDR		ARGOS		Krill density (CV)
	No. birds	Deployment duration (days ±sd)	No. birds	Deployment duration (days ±sd)
2001	7	3.71 ±0.25	8	2.41 ±0.73	37 (27)
2002	10	2.83 ±0.58	20	2.05 ±1.08	137 (30)
2003	9	5.13 ±1.58	11	4.93 ±0.81	85 (58)
2004	11	6.42 ±2.54	11	4.81 ±2.20	26 (10)
2005	8	5.54 ±1.58	20	3.65 ±1.27	89 (61)