Appendix 3. Selection table for environmental models used to predict the number of power line collisions recorded per survey period. This represented the second stage of the first tier of model selection and was intended to determine the environmental variables that most influenced collision probability. Model covariates included mean wind speed (Mean Wind) and its quadratic transformation (Mean Wind (quadratic)) and the quadratic of max observed windspeed (max Wind (quadratic), percent cloud cover (% Clouds), whether the moon was visible to the observer (Moon visibility), the daily percent moon fullness (% Moon), the presence of fog (Fog), whether or not precipitation occurred (Precipitation), ambient air temperature (Temperature), and percent humidity (Relative Humidity). Additional models were examined, but only those that outperformed the null are presented. Models were ranked via Akaike Information Criterion corrected for small sample sizes (AICc) and are presented with coefficient estimates and significance levels (***p < 0.001, **p < 0.01, *p < 0.05, ^p < 0.10) for individual covariates, as well as model degrees of freedom (df), log-likelihood (Log Lik.), AICc, ΔAICc, and model weight (Wt.). Covariates from models that outperformed the null model with ΔAIC < 2.0 and/or a model weight > 0.10, included Mean Wind (quadratic), and Precipitation and were advanced to the second tier of model selection along with covariates from the first stage of tier one.

Model †	Mean Wind	Mean Wind (quadratic)	Max Wind (quadratic)	% Clouds	Moon Visibility	% Moon	Fog	Precipitation	Temperature	Relative Humidity	df	Log Lik.	AICc	ΔAICc	Wt.
Precip. & Wind		+**						-16.26			5	-87.5	185.8	0.00	0.194
Precip. & Wind			+***					-12.32			5	-88.0	186.9	1.03	0.116
Wind		+**									4	-89.4	187.4	1.57	0.088
Wind & Vis.		+**					-6.34				5	-88.4	187.6	1.80	0.079
Wind & Vis.		+*		-0.0083							5	-88.6	188.1	2.21	0.064
Wind			+*								4	-90.0	188.6	2.75	0.049
Wind & Vis.			+*		0.8022						5	-89.0	188.7	2.90	0.045
Wind & Vis.		+*			0.5451						5	-89.0	188.8	2.92	0.045
Wind & Vis.			+*				-5.68				5	-89.1	189.1	3.24	0.038
Wind & Humid.		+*								-0.0095	5	-89.2	189.1	3.29	0.037
Wind, Vis. & Precip.		+*		-0.0043	0.3408			-12.56			7	-87.0	189.6	3.73	0.030
Wind & Vis.			+*	-0.0069							5	-89.5	189.8	3.94	0.027
Wind & Temp.			+*						-0.0346		5	-89.6	190.0	4.20	0.024
Precip. & Wind	0.0738*							-11.49			4	-91.0	190.6	4.73	0.018
Wind & Humid.			+*							-0.0051	5	-90.0	190.7	4.88	0.017
Wind & Vis.			+*			-0.0003					5	-90.0	190.9	5.03	0.016
Precip.								-8.57			3	-92.6	191.6	5.73	0.011
Wind & Vis.			+*	-0.0097		-0.0065					6	-89.2	191.6	5.81	0.011
Precip. & Vis.					0.70180			-7.24			4	-91.9	192.3	6.48	0.008
Precip. & Vis.							-11.09	-8.53			4	-92.1	192.7	6.89	0.006
Null											2	-94.4	193.0	7.20	0.005
† “Wind” indicates wind speeds, “Precip.” represents precipitation measures, “Temp.” represents hourly temperature measures, and “Humid.” Represents the relative humidity which all were recorded at the Iain Nicholson Audubon Rowe Sanctuary weather station. “Vis.” indicates whether or not fog was present, as documented by the observers, during each observation.