Degen's water snake

Degen's water snake (Crotaphopeltis degeni), also known commonly as Degen's herald snake and the yellow-flanked snake, is a species of snake in the family Colubridae. The species is native to Sub-Saharan Africa.

Etymology
The specific name, degeni, is in honor of Swiss-born Edward J. E. Degen (1852–1922), who collected natural history specimens in Africa, and later worked as a taxidermist at the British Museum (Natural History).

Geographic range
C. degeni is found in Cameroon, Central African Republic, Ethiopia, Kenya, South Sudan, Tanzania, and Uganda.

Habitat
The preferred natural habitats of C. degeni are mesic savanna and freshwater wetlands, at altitudes of 500 –.

Behavior
C. degeni is semiaquatic and nocturnal. It swims well, and during the day it hides in holes in the ground and in vegetation near water.

Diet
C. degeni preys upon amphibians and perhaps also upon small fishes.

Reproduction
C. degeni is oviparous. Clutch size is six eggs.