Spring really must be coming to all you up North. A couple of days ago we watched the magical flow of hundreds of Swainson’s Hawks passing over La Loma on their long journey to temperate North America from Argentina’s pampas. The birds depend on air thermals to facilitate their flight and as a result they steer clear of crossing large stretches of water from which air thermals rarely rise. Over the skinny little land bridge of Panama, observers get to witness thick concentrations of these flocks or ‘kettles’. It looks like a few local vultures have joined this kettle for a short joy ride.