puff adder

US /ˈpʌf ˌæd.ər/
UK /ˈpʌf ˌæd.ər/
"puff adder" picture
1.

a large, venomous viper (Bitis arietans) of Africa and Arabia, known for its stout body and ability to inflate its body and hiss loudly when threatened

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The hiker narrowly avoided stepping on a camouflaged puff adder.
The puff adder is responsible for more snakebite fatalities in Africa than any other snake.