This is an informational book on some of the world's unsolved mysteries, there are some videos linked so you have a broader understanding of the concept.
George Wieland, an early 20th-century paleontologist, argued that the dinosaurs ate themselves into extinction. The ancestors of the fearsome Tyrannosaurus, he said, probably "got their first impulse toward gigantism on a diet of sauropod eggs." Even the most caring of dinosaur mothers couldn't stop the near-constant depredations of egg-hungry carnivores.
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Wieland conceded that monitor lizards and snakes may have consumed their share of embryonic dinosaurs, too, but the Yale researcher ultimately concluded that, "The potent feeders on dinosaur eggs and young must be sought for amongst the dinosaurians themselves." In the years since Wieland's 1925 hypothesis, fossil evidence has confirmed that dinosaurs, snakes and even mammals preyed on dinosaur eggs and infants, but never at a rate that could have caused mass extinction.
Pathological(abnormal) Shells
Invertebrate fossil expert(people who study fossils of animals without any spines) H.K. Erben and colleagues thought that eggs led to the dinosaurian downfall in a different way. In a 1979 paper, the researchers reported that fossilised dinosaur eggshell fragments found in southern France and the Spanish Pyrenees showed two sorts of disorders, some had multiple shell layers, while others were really thin. Either situation was lethal.
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Multi-layered eggs could have suffocated developing dinosaurs, while thin eggs easily broke or dehydrated the embryos. Some sort of climate change spurred hormonal changes in dinosaur mothers, the researchers suggested. But this explanation didn't fit for other dinosaurs around the globe at the time. The deformed eggshells seem to have been a local phenomenon.
Too many males
Yes, weird right? Sherman Silber didn't think so.Within the past decade, infertility specialist(people who study about babies and why some die after being born) Sherman Silber has repeatedly asserted that dinosaurs perished because they couldn't find mates. Silber has speculated that(much like present-day alligators and crocodiles) changes in external temperature could determine the gender of dinosaur embryos developing in their eggs. In this case, he has argued, climate change caused by volcanic activity and asteroid impact could have skewed the global thermostat so that only one gender was produced. But beyond the fact that we really don't know whether dinosaur genders were determined by temperature or genetics alone, the idea doesn't explain why reptiles that probably did have temperature-determined genders, such as crocodilians, survived while non-avian dinosaurs died out.
Caterpillars
Yes, Caterpillars, those nasty little things, I knew they were upto something. Sorry, let's continue. In a fight, a caterpillar would hardly seem to be a match for a Triceratops. But in a 1962 paper based on his observations of the devastation caterpillars could cause among crops, entomologist(people who study insects) Stanley Flanders proposed that the larvae of the first moths and butterflies would have quickly and totally denuded the Cretaceous landscape of vegetation.
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Herbivorous dinosaurs would have starved, Stanley argued, and predatory dinosaurs would soon be left with nothing to eat but each other. But not only did butterflies and moths coexist with dinosaurs for millions of years, there is no sign of such a disastrous caterpillar spike in the fossil record.
Aliens
Ah yes, finally aliens, when people don't have any explanation for some action, they always point towards extra terrestrial organisms(basically aliens). Well, it has been proven that there aren't any aliens involved with how the dinosaurs went extinct but some creative minds out there have come up with many theories involving aliens.
