What causes the Anhinga to sometimes be referred to colloquially as the 'snakebird'?

Answer

Its long, thin neck, which remains visible above the water when the rest of its body is submerged during stalking

The Anhinga is sometimes colloquially referred to as the 'snakebird' because of its long, thin neck, which remains visible above the water when the rest of its body is submerged during stalking.

What causes the Anhinga to sometimes be referred to colloquially as the 'snakebird'?
dietbirdPredatorsnakecormorant