Just something I've come up with. What we know about dinosaurs and other extinct creatures certainly doesn't compare to how we know modern animals, due to very obvious factors. Ethology is the study of animal behaviour, something that we can't be sure of in dinosaurs - so, a catalogue of certain dinosaur behaviour is what I'm trying to display here...
Of course, this is a work of fiction, its all speculative. It isn't based on any palaeontological evidence, rather, evidence of the natural world as it is. This below piece on the lifestyle of Giganotosaurus, for example, is based off the lifestyle of lions. Take a look at this and give me your thoughts, and if you want, post your own ones!
GIGANOTOSAURUSDescription: A massive mid-Cretaceous carnivore and the apex predator of Cenomanian Argentina, Giganotosaurus superficially resembles the largest of the Laurasian tyrannosaurids, but with notable differences with the ridged crests on its skull (males only), longer, though relatively narrower jaws and muscular forearms with three visible fingers as opposed to two.
Males and females are almost identical in colour, with vividly emerald green heads and flanks grading into dark grey and tan underparts. The young, are notable for being covered in a mossy-brown down for around the first two years of their life, and are relatively helpless for this time, susceptible to predation by ornithocheirid or azdarchid pterosaurs, small carnivores such as Buitreraptor, or even more substantially sized abelisaur threats, such as Skorpiovenator or Ekrixinatosaurus. It is lucky for these hatchlings therefore, that their parents are such capable defenders. Giganotosaurus can live for up to sixty years, but are generally called before their time due to their violent lifestyle. (See below).
Lifestyle: Giganotosaurus live in a very much patriarchal hierarchy, with small to medium sized groups, known by the collective noun as ëshades.’ These shades are dominated by a single adult male, who mates ritually with all the females in his harem (can be up to ten) producing a multitude of offspring. Male offspring are typically driven from the shade when they reach sexual maturity, although can return to challenge the alpha male for dominance of the shade – new blood comes into the group via unrelated males rising to the challenge. The majority of the hunting is done by the females, who specialize in tackling hypermassive titanosaur sauropods such as Andesaurus and Argentinosaurus, which they surround and mob systematically, tearing off chunks of flesh before doubling back and waiting for the wounds to finish them. This activity is not without its risks – the shade need to ensure they tackle only the young, vulnerable or weak, or they are in extreme danger of getting crushed to death under the sauropods’ weight or killed by a single flick of their whip-like tail. Less risky sauropods to hunt include the smaller rebacchisaurid Limaysaurus.
As the apex predators, Giganotosaurus have very little to fear from other carnivores, although they and the contemporary spinosaurid Oxalaia tend to stay out of each other’s’ way. Occasionally, Giganotosaurus go head-to-head with the large abelisaurid Ekrixinatosaurus, with varied results, but only when disputes between food or territory become extremely direct, and when neither animal refuses to yield peacefully.