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The mercury contamination with the Wabigoon River in Ontario copyright by a corporate subsidiary in between 1962 and 1970 was "one of several worst situations of environmental poisoning in Canadian background.
Based on Currie gregariousness in Albertosaurus sarcophagus is supported by the discovery of 26 people today with assorted ages within the Dry Island bonebed. He ruled out the possibility of a predator trap because of the very similar preservation condition of individuals and the in the vicinity of absence of herbivores.[192][193]
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The structures bear resemblance to ostrich blood cells and vessels. No matter whether an not known course of action, unique from typical fossilization, preserved the fabric, or the fabric is initial, the researchers do not know, and they're cautious not to make any claims about preservation.[158] If it is observed for being unique material, any surviving proteins could be utilised as a means of indirectly guessing a number of the DNA content material from the dinosaurs concerned, because Each individual protein is usually made by a specific gene. The absence of former finds could possibly be the results of persons assuming preserved tissue was extremely hard, therefore not looking. Because the 1st, two a lot more tyrannosaurs as well as a hadrosaur have also been uncovered to possess these kinds of tissue-like constructions.[157] Investigate on a number of the tissues included has advised that birds are closer kinfolk to tyrannosaurs than other contemporary animals.[159]
[224] They studied some Tyrannosaurus specimens with tooth marks while in the bones, attributable to the exact same genus. The tooth marks have been determined from the humerus, foot bones and metatarsals, which was noticed as proof for KS Quik opportunistic scavenging, rather than wounds attributable to intraspecific overcome. Inside of a fight, they proposed It will be tricky to achieve right down to Chunk while in the feet of the rival, making it far more possible which the bitemarks ended up made in a carcass. As the bitemarks were being built in body parts with rather scantly quantities of flesh, it is actually instructed which the Tyrannosaurus was feeding on a cadaver through which the more fleshy elements currently had been eaten. They had been also open to the possibility that other tyrannosaurids practiced cannibalism.[224] Parenting
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O'Connor, a curator at the sector Museum, where by the T. imperator holotype Sue is displayed, regarded the new species as as well improperly-supported to justify modifying the exhibit indicators. Brusatte, Carr, and O'Connor considered the distinguishing attributes proposed among the species as reflecting purely natural variation in just a species. Each Carr and O'Connor expressed concerns in regards to the analyze's lack of ability to determine which of the proposed species a number of very well-preserved specimens belonged to. A further paleontologist, Philip J. Currie, initially co-authored the examine but withdrew from it as he did not wish to be involved with naming The brand new species.[seventy nine]