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Possible Theories

......Changes in climate. Changes in the minimum and maximum temperatures could have imposed stresses upon the dinosaurs that they could not adapt to in sufficient time. Every possible change in climate appears to have been suggested for the downfall of the dinosaurs. Also try Climate change page!


....Too much Carbon Dioxide in the atmosphere due to the decrease of oxygen producing algae, making the climate too hot. This could have resulted in changes to the weather systems and rainfall patterns. A warmer climate would also effect the female:male ratio of hatchlings, as sex is determined by incubation temperature There could also be a decrease in the number male sperm produced, due to a warm climate which could reduce population size. Finally a hot climate could have caused the dinosaurs to become overheated in the summer if they were endothermic.

.....Climate too cold, which meant embryo development was inhibited, reducing dinosaur numbers. Furthermore if the dinosaurs were cold blooded, they would not have been able to survive through very harsh winters, as they were too large to hibernate and were unable to keep their body temperature at an appropriate temperature.

....Climate too wet.

...Climate too dry, making the environment arid and inhospitable.

...Nearby supernova explosion could heat the upper atmosphere, but also disturb the ozone layer and produce large ice clouds in the high atmosphere, ultimately cooling the environment.


......Mental disorders, including a decrease in brain size resulting in stupidity. There is evidence that many of the large dinosaurs, must have had very small brains in comparison to their total body size, possibly as small as a kitten's brain. With such small brain capacity responses to the surrounding environment would have been so slow that they could not compete with faster thinking animals.
An alternative is that there was a lack of consciousness and ability to change behaviour patterns.


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