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Lamprophis inornatus
Snake on bedroom floor at Lewa Conservancy.
Don't think it's a black mamba because it is constricting its prey.
davidvoss black mambas are not constrictors and in general they prefer warm blooded food. however a friend of mine said this is most likely a olive house snake as they are small constrictors and do eat geckos.
It may be a juvenile back mamba based on the following entry in Wikipedia:
"Once prey is detected, the black mamba "freezes" before hurling itself forward and issuing several quick bites, swiftly killing its prey. If the prey attempts to escape, the black mamba will follow up its initial bite with a series of strikes. It will release larger prey after biting it, but smaller prey, such as birds or rats, are held until the prey's muscles stop moving.