Table 2.

Accuracy^a (%) of the sampling methods used in the semi-naturalistic cages.

	frequency			duration
	age (months)			age (months)
behaviour	3	8	13	3	8	13
burrowing	116	110	95	105	113	119
climbing	102	97	104	107	117	117
upright standing	97	100	107	92	111	112
lateral stretching	88	70	88	84	64	88

^aValues represent the estimated frequency and duration relative to the full 24-h sample; accuracy = estimated value/sampled value × 100.