Merops is a large genus of bee-eaters, a group of birds in the family Meropidae, native to Africa, Asia, Australia and Europe. 
The genus name is Ancient Greek for "bee-eater".

1/ Asian green bee-eater (Trảu xanh nhỏ, Merops orientalis), also known as little green bee-eater, and green bee-eater
2/ Chestnut-headed bee-eater (Trảu họng vàng, Merops leschenaulti), or bay-headed bee-eater
3/ Blue-throated bee-eater (Trảu họng xanh, Merops viridis)
4/ Blue-tailed bee-eater (Trảu ngực nâu, Trảu đuôi xanh, Merops philippinus)