Insects first appeared 300 million years ago, even further back in time than dinosaurs. The oldest definitive insect fossil being the Rhyniognatha hirsti, estimated at407 to 396 million years ago. Insects were around 100 million years before dinosaurs and 350 million years before humans (the first humans are only 100,000 years old). From all the early prehistoric insect species, only cockroaches have survived. Most of the insect orders seen today were around 180 million years ago, during the Jurassic Period.