The best replacement for king cobra is black mamba.

The best alternatives to king cobra are rated as following:
★★★★★  black mamba
★★★  mongoose
★★★  rattlesnake
★★  anaconda
★★  king snake
★  baby
★  python colt
★  reticulated python
★  komodo
★  viper
★  colt python
  mangrove snake
  copperhead racer
  saltwater crocodile
  king cobra
  komodo dragon
  anaconda youtube
  rat snake
  inland taipan

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Other search terms related to king cobra and their ratings are:
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king cobra
black mamba
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