Imre and Peter have reached the 1000 mile sign (if there were such thing on the Yukon). They are close to accomplishing half of the total 2100 miles. Please check their progress here.
They encountered a mountain lion with her cub, but what really bothers them are the horse flies. Peter got 4 of them with his paddle. Even worse are the mosquitos, a constant nuisance in some areas.
They were amazed by a beautiful sunrise at 1am, one that painted the water glossy pink.
Below are screenshots from a video they shot by flying a kite.