On 25th March 2009, Choo Teik Ju sent in this note:
“Just to drop you a note that there are lots of nesting activities going on at Ubin. I saw Grey Heron (Ardea cinerea), White-bellied Sea Eagle (2 couples) (Haliaeetus leucogaster), Pacific Swallow (Hirundo tahitica), Common Iora (Aegithina tiphia), Black-naped Oriole (Oriolus chinensis) and Purple-throated Sunbird (Leptocoma sperata) picking up twigs and building nests. Pacific Swallow attracts me most as this bird collects not only grass/small twig, but it also collect mud from the cycling path (left).
“I saw Barn Swallow ( Hirundo rustica ) nests in China, made completely with mud, but Pacific Swallow builds its nest with both twigs and mud. I am not sure if this latter swallow understands the physics of strength but definitely it is a stronger nest construction.”