New flier spotted

By me, that is. A visit to Adyar Poonga yesterday added two more butterflies to my list. This is one of them - the Lime Butterfly (Papilio demoleus). Although it is described as the most common of the 'Swallowtail' butterflies, I am fairly sure there weren't too many of these in Chennai until a few days, maybe a few weeks, ago. And then, suddenly, they seemed to be everywhere around.

One explanation is that they are migrating from the hills to the plains. Maybe they are moving to avoid the cold, maybe to find food. The movements of butterflies seem to be more mysterious than those of birds and much more difficult to study. Yet, almost anyone in Chennai with even a casual interest in nature would have (and several have, indeed) observed the more-than-usual number of butterflies this season. In some places - by the Thiru Vi Ka bridge, for instance - the air is thick with these and other butterflies; birds swoop and swerve, trying to catch them. If more motorists were nature enthusiasts, traffic on the bridge would have come to a standstill!