Every year, we find and monitor all of the Canada Jay nests within our study population. Once the nestlings are old enough, we access nests take measures and attach a unique combination of colour leg bands that helps us identify birds the following fall and winter when they are adults. The picture shows Dan Strickland ascending to a nest to put back nestlings after they have been banded. When nests are too high to access by ladder, we hire an arborist to climb the tree. The arborist lowers down the nestlings, they are processed on the ground, and then sent back up to be put safely in the nest.