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I'm pretty sure that the full expression is 'flat out like a lizard drinking'. Which is presumably because they can't kneel elegantly at the watering hole, and

I'm pretty sure that the full expression is 'flat out like a lizard drinking'. Which is presumably because they can't kneel elegantly at the watering hole, and just splay their limbs.

nthcolumn 9y ago
Yeah it is that. Some monitors carry their heads up most of the time but lie flat to drink.