They became extinct during the late 19th century when humans over-hunted them. The Calvaria Tree stopped sprouting seeds soon after. Scientists finally concluded that, for the seeds of the Calvaria Tree to sprout, they needed to first be digested by the dodo bird. By force-feeding the seeds to a domestic turkey, who digested the seeds the same way as the Dodo birds, the trees were saved. Unfortunately humans will not be able to save each species in this same way.
Every animal has the ability to protect itself from being someone's next meal.
Each species has evolved with its own set of unique adaptations, ways of helping them to survive. An average of 137 species of life forms are driven into extinction every day in the world's tropical rainforests. The forces of destruction such as logging, cattle ranching have all contributed to the loss of millions of acres of tropical rainforest. Animals and people alike lose their homes when trees are cut down. Many large mammals such as leopards and apes need miles and miles of territory to roam and have a tough time surviving in the smaller and fragmented habitats they are forced into by humans.