Online Resource 1 s9

Online Resource 1

Table 1. Summary of predatory interactions observed between polar bears and snow geese at La Pérouse Bay in 2011.

Max Daily Chase Time # Goose Temp Event Date Time Bear Class Chases (s) Prey Class (°C) Water

1 July 20† 15:05 sub-adult 2 30, 15 ≥ 2 A,G 12.9 Yes 2 July 22 12:15 adult 1 <15 1 G 24.3 No 3 July 25 12:45 sow with cuba 1 45 1 G 27.1 Yes 4 July 25 22:12 sow with cuba - - 1 A 27.1 Yes 5 July 28†† 10:05 sub-adultb 4 12, 50, 10, 30 3 A 18.5 Yes 6 July 30 20:00 sub-adultb - - 1 A 20.9 -

Note. ― “Bear Class” is the stage class of bears observed in the predation event. “Chases” is the number of chases observed in each predation event. “# Prey” is the total number of prey caught across all chases in the event. “Goose Class” is the stage class(es) of geese that were caught; A = adult, G = Gosling. “Max Daily Temp” is the maximum temperature on the day of the event, recorded at the long-term weather station in Churchill, MB. “Water” indicates whether or not any of the associated chases took place in water. Values that we were unable to ascertain from our observations are denoted with “-”.

a, b indicate individual bears that were potentially common to multiple events.

† Event is also presented in supplementary video Online Resource 2. †† Event is also presented in supplementary video Online Resource 3.