Dinosaur Stress: Stress on dinosaurs is a possible solution to their extinction. This theory was first invented by Heinrch K. Erben when he discovered that the shell thickness of a certain type of dinosaur species decreased over time. It was thought that the warm climate and good habitats of the Cretaceous could have caused an overpopulation of dinosaurs, thus leading to increased stress on the dinosaurs. Stress is known to cause hormonal imbalances in modern-day birds and lizards. So this could have happened to female dinosaurs. An increase in estrogen in dinosaurs may have caused females to lay eggs with shells that were too thin. If this happened, it would significantly reduce the chances of the young hatching and living to adulthood. Caterpillars: Caterpillars that evolved at the end of the Cretaceous period may have stripped plants of their leaves, a valuable food for the plant that eats them. dinosaurs. If the caterpillars managed to tear all the leaves off the trees, the herbivores would have nothing left to eat and would die. If plant eaters died, meat eaters would die from lack of food. However, this theory is considered extremely unlikely, as the caterpillars are expected to strip all the world's trees of their leaves virtually at the same time. Supernova: A supernova is a star that explodes. It can project materials enormous distances in space. Some scientists believe that cosmic radiation from the explosion would cause extremely high rates of fatal cancers in dinosaurs. Others believe that the radiation reacted with the Earth's atmosphere and destroyed the ozone layer. Without the ozone layer to filter out dangerous radiation, once again high rates of cancer middle of paper ......s would be due to the Earth tilting 23.5 degrees in due to either an asteroid impact or debris from passing comets. This theory is also related to that of volcanic activity, due to the high number of eruptions of volcanoes, more harmful gases would have been released into the atmosphere, causing high temperature changes which could have been harmful to many dinosaur species, for example. cold-water creatures could have been affected by a change in water temperature, which would suit tropical fish more than their own species of cold-water animals. //www.unmuseum.org/deaddino.htmhttp://www.unmuseum.org/deaddino.htmhttp://library.thinkquest.org/C005824/extinction2.htmlhttp://library.thinkquest.org/C005824/extinction2. htmlhttp://library.thinkquest.org/C005824/extinction.html