Table 4. Risk evaluation of consumed corn seeds based on avian acute oral toxicity.

Species	Body weight (kg)a	Number of corn seeds consumed		Doseb (mg a.i./kg bw)	Fraction of LD50 (%)c
		Treated	Unknown
Red-winged blackbird	0.06	0	1	0–22	0–5.2
Blue jay	0.09	1	1	14–29	3.5–7.0
American crow	0.55	1	0	2.4	0.6
Canada goose	4.5	0	7	0–2	0–0.5

Notes:

^aFor the red-winged blackbird, the body weight is represented by the median value of the body weight range reported by Rosenthal (2004); for the blue jay and American crow, values were taken from Poole (1938) for the Canada goose value was taken from BC MOE (British Columbia Ministry of the Environment) (1996).

^b= (Seed dose * Total number of seeds consumed)/Body weight^a. The seed dose is the mean measured clothianidin concentration per seed (1.3 mg a.i./seed). If a range is shown, the lower limit represents only exposure via consumption of treated seeds and the upper limit represents estimated exposure if all seeds with unknown treatment status are assumed to be treated seeds.

^c= Potential exposed dose^b/The lowest available acute avian LD50 of 414 mg a.i./kg-bw for the red-winged blackbird. If a range is shown, the lower limit represents only exposure via consumption of treated seeds and the upper limit represents estimated exposure if all seeds with unknown treatment status are assumed to be treated seeds.