Kathmandu. The Top birds, nicknamed engineer birds, are very busy building their nests. This bird, also known by names like 'Koterro', 'Sujero', 'Bakecho', stops at a suitable place to build its nest when migrating. Primarily making the Terai its habitat, these birds move uphill after Jestha. It is during this time that this bird is seen around the Kathmandu Valley. The main diet of the Top bird is rice and grains. Therefore, it prefers to live near fields and ponds with water. In these birds, the males have yellow around their heads and necks. Females are dull. After coming to...