The best replacement for black mamba is cobra.

The best alternatives to black mamba are rated as following:
★★★★★  cobra
★★★★  king cobra
★★★  mongoose
★★★  taipan
★★  green mamba
★★  outlaw 2
★★  copperhead
★  white mamba
★  honey badger
★  coral snake
★  puff adder
★  king james
  durantula
  inland taipan
  taipan snake
  rattlesnake
  fierce snake
  rattle snake

Your alternative for black mamba is not listed? Suggest!
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Other search terms related to black mamba and their ratings are:
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black mamba
cobra
king cobra