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, a great clade of herbivorous dinosaurs, appeared , but were initially marginal dinosaurs and did not begin becoming abundant until the late Jurassic. If dinosaurs all have the same common ancestor, ornithischian dinosaurs quickly diverged, with their different hips, and so far, there is no good evidence that ornithischians breathed with the air sac system, and they became the dominant herbivores in the relatively high-oxygen Cretaceous. The ornithischian advantage was a superior eating system. Ornithischians were the only dinosaurs that chewed their food. Chewing squeezes more calories from plant matter and may be why ornithischians surpassed sauropods in the Cretaceous. Sauropods did not chew their food but had rock-filled , as birds and reptiles do today. in the late Triassic. Only rare ornithischians had gizzards. Sauropods also had the smallest proportional brains of any dinosaur. The most encephalized dinosaurs were , some of which were featured as clever killers in . Theropods were the most encephalized dinosaurs, which is an early example of predators having larger brains in order to outsmart their prey. were in second place only to theropods in encephalization and were among the most successful Cretaceous herbivores. A fascinating aspect of some ornithopods was their seeming ability to communicate by bugling with a . This kind of evidence strongly supports the idea of herd behavior in herbivorous dinosaurs. There is also evidence of a , which has been keenly contested (, ) in recent years.
Love, Sex and Dating For The Modern Nerd
Descriptive Annotation: At the beginning of the book, a beaver is sad because he has no friends. He cries out in sadness and gets a reply exactly as he had spoken. He then goes on a journey to find the source of this voice as he wishes to be friends with this creature who is exactly like him. On his journey, the beaver finds other small creatures who do not have friends, and they become friends together in their pursuit of the voice. After gaining a group of friends, the beaver asks an elder where he might find the voice. It turns out that the voice is an echo, but it is described as being happy when beaver is happy and sad when he is sad. It is a tale on finding friends through an adventure to find the voice. It is a cute book that also has a learning opportunity.
Linguistic and Cultural Diversity Analysis: Students may begin to wonder on the workings of the echo. The book is a feel-good book that also has an educational value. It can also be used in teaching values of friendship and building/finding those friends.