AI Summary

Two species of South American sauropods were uniquely suited for standing upright on their hind legs. Their robust femurs were capable of handling the immense forces involved in this posture, particularly when the dinosaurs were younger. This ability may have provided several advantages, including access to treetop foliage, enhanced defense against predators, or improved mating prospects. The sauropods' robust leg bones allowed them to support their body weight in an upright position, which may have been beneficial in various ways. The findings suggest that these dinosaurs were well-adapted to standing on their hind legs, at least during their younger years. However, it is unclear how this ability may have changed as they grew larger.

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