There are 26 species of Bee-eaters and 6 of them are represented in South-East Asia. One of these species is the Blue-throated bee-eater (Merops viridis). This species is not endemic to the area around Penang and come south from Thailand to breed. They are slightly bigger than the Chestnut-headed Bee-eaters, that nest in the same location, and have the characteristic elongated central tail feathers. Again there is little obvious difference between males and female unless the pair is compared alongside each other. Their breeding season is from February to August.