Dowrog - and the precision of Ibis roost flights

A couple of late afternoon visits to Dowrog on Friday and Saturday were rewarding, with the two Glossy Ibis, a Barn Owl and Hen Harriers (m+f) seen on both occasions, and a Short-eared Owl also seen on Saturday afternoon.

Of particular interest, however, was the precise timing of the Glossy Ibis flypast over Dowrog to the roost at St David's Airfield over the two days.   I photographed the birds as they flew over Dowrog Common on both afternoons, and the time of the photographs differed by only six seconds over the two days (they appeared at 16:47:34 on Friday and 16:47:40 on Saturday).  Impressively precise body clocks those birds have....