What unique, sometimes reduced or absent, feature can be found between the eyes of a Gaboon viper?

Answer

One or two horn-like scales

A unique feature often observed on the head, though sometimes reduced or absent, is the presence of one or two horn-like scales situated between the eyes.

What unique, sometimes reduced or absent, feature can be found between the eyes of a Gaboon viper?

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Gaboon viper facts! - YouTube

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