Table 5. Observed frequencies of the numbers of carcasses found per search in the 2007 data set compared to the ones predicted from our two models (see text).

Number of carcasses found	0	1	2	3	4
observed frequency	453	18	2	0	0
predicted by 1-level observation model	453 (445–458)	18 (11–25)	3 (0–4)	0 (0–0)	0 (0–0)
predicted by 3-level observation model	449 (441–456)	22 (14–29)	2 (0–5)	0 (0–0)	0 (0–0)

The ranges are 95% prediction intervals for the model predictions.