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The image in that Wikipedia article then must be a rare photo of a frigate on the ground.

Yeah it is ironic, isn't it? I've never seen one on the ground, and only rarely seen them on cliffs.

The article text claims that they "roost on trees or cliffs at night".

so 1/3 of their life on the ground?

I think the point was that they have difficulty initiating flight without having something to fall off of.