When the temperature drops to a sunny -20°C, or below, that's the time to dress warmly and head over to the "ridge" at Mud Lake.

Mud Lake is a very popular conservation area in Ottawa's west end know for its birding and great variety of friendly creatures.

The "ridge" is an overgrown embankment of rocks (human-made?) that has many fissures allowing moist warm air to rise to the surface and freeze to the rock edges and vegetation.

The freezing air forms beautiful fern/fan-like shapes.

(Best viewed on desktop, or horizontally on a handheld device)