Normally when it rains birds take shelter, usually under the foliage LINK. However, Singapore recently experienced a period of drought. So when there were light showers during this period, birds took advantage of the rain to have a bath.
Recently field ornithologist Wang Luan Keng was pleasantly delighted when she encountered birds perching in the open to enjoy the rain. There were a few Blue-tailed Bee-eaters (Merops philippinus) crouching low on the exposed ends of Casuarina branches (above). They had their wings splayed with tail feathers fanned. This allowed the raindrops to soak through their feathers. Regularly the birds shook themselves vigorously to remove excess water. No doubt after their bath the feathers would be preened and if the sun was out they would sun themselves. In this way they keep their feathers in good condition. See also HERE.
There were also Black-shouldered Kites (Elanus caeruleus) taking advantage of the rain, The image above shows one perching on a dead branch taking up a similar position as seen with the bee-eaters.
Wang Luan Keng