These are yellow and black kraits. There are also "Blue Kraits" which are black and white. And the red headed krait which looks nothing like either of them.

Bungarus Fasciatus (Banded Krait)

Thais say: (ngoo sam lee-um, or ngoo kan plong) This is a bit confused in Thailand where, in southern Thailand any viper is known as Ngoo sam lee-um. Lee-um means triangle, and so some people confuse triangle shaped heads of the vipers with triangle cross-section of the kraits.

Length: average 1.5m up to 2m (about 6.5 feet) In Thailand they don't usually reach a full 2m.

Range: All over Thailand and most of Asia

Notes: I…