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Re: Lack of Running Giant Theropod Tracks
Not to contradict anything here, and I apologize if this has been
mentioned already... but there is good evidence that the titanosaur
sauropod _Paralititan_ lived in a mangrove environment. The holotype
was found in mangrove deposits, and the shallow water (indicated by
plant roots within the same layer as the bones) and slow current
(indicated by the fine-grained sediments, bivalves, etc) strongly
suggest that the sauropod carcass was not transported to the mangrove
habitat from somewhere else. Instead, the evidence suggests that this
particular _Paralititan_ walked to the mangrove over tidal flats and
along tidal channels, before it dropped dead.
Not only that, but the _Paralititan_ carcass was then scavenged by a
theropod, which left a tooth behind (cf. _Carcharodontosaurus_) - so
the theropod was presumably also comfortable in the mangrove habitat.
Based on oxygen isotope ratios, we know that _Spinosaurus_ spent a lot
of its time in water, despite its skeleton having few (if any) aquatic
Amiot et al. (2010). Oxygen isotope evidence for semi-aquatic habits
among spinosaurid theropods. Geology 38: 139–142.
Smith et al. (2001). A giant sauropod dinosaur from an Upper
Cretaceous mangrove deposit in Egypt. Science 292: 1704–1706.