This analysis reveals the lumbosacral expansion of the spinal cord in birds, suggesting commonalities with other species.
This is the second post in the "bird neural canals are weird" series (intro post here), and it covers the first of five expansions of the spinal cord or meninges in the lumbosacral regions of birds. The lumbosacral expansion of the spinal cord is not unique to birds and doesn't require any special explanation.
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Matt Wedel (2018) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: