click to enlarge

A large pit viper, I think.
Normally I can rattle off the species of almost any reptile from memory but am not too good at ID from a view of their chins, and on this visit I didn't read any of the name plates either.

I caught this pair of juvenile komodo dragons--the SA Zoo has succeeded in breeding them.
My plan of attack for the often poorly-lit reptiles was to shoot in aperture priority mode @f2 and iso200, using a rubber lens hood that I could press against the glass to block reflections plus a monopod for added stability at shutter speeds that were definitely beyond handheld range.
The shallow DOF doesn't bother me a bit.