Canada geese () nesting on elevated structures in urban Indiana, USA.

The Canada goose () population has radically changed over the past 60 years-from once being extirpated in the state of Indiana to the current level of approximately 113,000. High urban densities have resulted in persistent human-wildlife conflicts and novel interactions between geese and their physical environment. Canada geese typically choose nest sites that are on the ground or slightly elevated sites such as muskrat lodge, but we report observations of Canada geese nesting on rooftops 2.

The effect of weather on the decision to migrate from stopover sites by autumn-migrating ducks.

Background: Previous investigations of autumn-migrating ducks have reported weak connections between weather conditions and the decision to migrate from stopover sites. We leveraged relatively new weather surveillance radar technology to remotely detect departures of discrete groups of various species of migratory dabbling ducks () in autumn to more directly assess the effect of specific weather conditions on departure from discrete stopover sites.

Methods: Using radar data collected over fifteen years (1995-2009), we documented a consistent phenomenon where a single, identifiable group departed from our study area on 30% of days during the autumn study period, and no ducks departed on the other days.