The dinosaur believed to have a neck reaching nearly 50 feet long is the Mamenchisaurus.
Researchers have estimated the Mamenchisaurus's neck to be the longest of any sauropod species, possibly the longest neck ever observed in an animal. A study published in the Journal of Systematic Paleontology estimated the Mamenchisaurus's neck length based on fossil evidence. This remarkable length, exceeding that of an average school bus, highlights the extreme adaptations found in these long-necked dinosaurs.
