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Other dinosaur speculations & queries
Among dinosaurs, there would have existed "novel" social traits, e.g., could it be dinosaurs had "worker castes"? were capable of assessing if a female/male would be a nesting "mate"? were able to cognitively decide to join or leave a group, and, if joining, what "tasks" would be performed within the group. Social traits among dinosaurs (from genome to "societies"), including living avialian theropods, arise from already existing traits. Perhaps, among living dinosaurs, there could be found non-genetic sources of phenotype variability leading to evolution and selection. If found, one could interpolate variability of behaviour among pre-K/T dinosaurs? Can such possible behaviour be deduced from free-body force analyses of bone-muscle systems of well-preserved hadrosaur "mummies"? If cladistics has taught us anything since Jacques Gauthier's 1984 dissertational pre!
ntation of archosaur phylogenies, it is that species variations are rather wide-spread. If, for example, an allosaur family consisted of bright red animals, with stripes or spots, and, miles away, another family were blue allosaurs with no stripes or spots, would they be different species even if, osteologically, they could not be differentiated?
Hence, dinosaur social systems could have been influenced by pheromones, hormones, glands, the effects of food (be it meat or plant) on reproduction and behaviours. Moreover, it is probable learned behaviour among dinosaurs (as among extant taxa) had a significant influence on the origination of "novel" social traits. A posthatchling would have learned orientation and nestmate recognitions. Is there osteological evidence of enlarged braincases among some theropods within a group (such a fact could denote the brain was being used for integration)? Learning among social dinosaurs (e.g., Jack Horner's colonies of nesting hadrosaurs) > repeating of rewarded (adaptive) behaviours among juveniles, and this kind of behaviour is alterable by evolutionary selection processes. For example, among these hadrosaur juveniles, they would learn alarm responses from the adults, the learned responses transmittable to another generation. Foraging preferences among these ha!
osaurs would be learned, as would dominance/subordinance interactivity. Morphological/behavioral plasticities among these dinosaurs would "direct" genetic evolution on a molecular level.