Crimson sunbird 
(Hút mật đỏ, Aethopyga siparaja)

The crimson sunbird (Aethopyga siparaja) is a species of bird in the sunbird family Nectariniidae which feed largely on nectar. 

Nectariniidae: New Latin, from Nectarinia, type genus + -idae.
The name combines the Ancient Greek aithos meaning "fire" or "burning heat" with puge meaning "rump".
Malay name Sipa raja for the Sunda Crimson Sunbird (Aethopyga).