Temporal range: Pliocene
Aptenodytes ridgeni, also referred to as Ridgen's penguin, is an extinct species of penguin from the Pliocene of New Zealand. It was intermediate in size between its living congeners, standing an estimated 90–100 cm tall. The remains were first found in 1968 on a Canterbury region beach by 11-year-old schoolboy Alan Ridgen.
- Gill, B.J. (Convener, OSNZ Checklist Committee) (2010). Checklist of the Birds of New Zealand, Norfolk and Macquarie Islands, and the Ross Dependency, Antarctica. Fourth edition. Wellington: Te PaPa Press in association with the Ornithological Society of New Zealand. p. 330. ISBN 978-1-877385-59-9.
- Gill, Brian James (1991). New Zealand's extinct birds. Random Century. p. 25. ISBN 1-86941-125-0.
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