Actually two Pachyderms It's their size
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Anancus which is stood around 3 metres (9.8 ft) tall, with a weight up to 5 tons.
While Zygolophodon was a height of about 3.9–4.1 metres (12.8–13.5 ft) and a weight of about 14–16 tonnes (15.4–17.6 short tons).