Skin and Foot of Nilgai
Marsupials are the group of mammals commonly thought of as pouched mammals. They give live birth, but they do not have long gestation times like placental mammals. Instead, they give birth very early and the young animal, essentially a helpless embryo, climbs from the mother’s birth canal to the nipples. There it grabs on with its mouth and continues to develop, often for weeks or months depending on the species. The short gestation time is due to having a yolk-type placenta in the mother marsupial. Placental mammals nourish the developing embryo using the mother’s blood supply, allowing longer gestation times.
About the Animal
Iguanodon lived during the Early to Late Cretaceous period from 145-65 million years ago. They were very successful dinosaurs that had been around for 80 million years and they colonized every single continent. They were prey aimals for carnivores like Sarcosuchus, Utahraptor, and the immense Giganotosaurus. One reason Iguanodon were so successful is that they developed a new way of tackling Cretaceous plants.
Jason Hamilton, http://scienceviews.com/dinosaurs/iguanodon.html, 2010