A member or individual bird belonging to the dinornithidae family of giant extinct flightless New Zealand birds.
From dinornis + '-id' (member of group), creating a noun form meaning 'a dinornithid bird' or specifically a moa.
Calling a single moa a 'dinornithid' is like saying 'one member of the dinner-bird family'—it's a scientific way to talk about one individual from that extinct group.
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