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RE: Another query: Baryonyx a facultative quadruped?

Jenya Lipatov wrote:

Charig and Milner, circa 1996 I believe, proposed that _Baryonyx
walkeri_ may have been a facultative quadruped, but there was no
definitive evidence for this. Have there been any developments since
then on the issue of quadrupedalism in any Spinosaurids?

The issue of quadrupedalism in _Baryonyx_ has, by and large, died a natural death. There is no compelling evidence that spinosaurids were anything other than terrestrial bipeds. Ditto for other large terrestrial theropods that have been regarded by some researchers as possible quadrupeds (e.g., _Xuanhanosaurus_).

Some theropods may have been quadrupeds when they first crawled out of their eggs, when their big heads pushed their centers of mass well forward of the hips. Some small theropods (especially maniraptorans) were probably arboreal quadrupeds - i.e., using their arms and legs to climb trees. But there is no good evidence that any theropod is or was habitually quadrupedal on land.