Troodon is a relatively small, bird-like dinosaurs known definitively from the Cretaceous period (about 77 million years ago). Troodon stood at 3.28ft, weighed 100lbs, was 2.4 meters long, and could run at 39 kph. It was the smartest dinosaur ever discovered so far, with its intelligence equaling that have a modern day opossum. Its eyes were forward facing and large as well, which enabled to either hunt at night or to see in the dark long polar winters. Like many theropods living in the Arctic, it had feathers. These feathers were the same color as the feathers of the modern Hoatzin, a South American bird that spends its early life with claws. Troodon was an omnivore, as evidenced by their serrated teeth. Though they most certainly ate plants, they were known to have raided the nests of large herbivores in its area, such as Pachyrhinosaurus. They were also known to eat fish, mammals like Alphadon, and even scavenge. It is possible they were pack hunters, but there is no real evidence of this behavior. Troodon have been known to group together when they are attracted to a carcass, but Komodo dragons do this as well and they do not hunt in packs. When incubating, male Troodon would sit on the nest like modern birds do. Troodon appears to have a type of reproduction that is intermediate between crocodiles and birds. Troodon was intermediate, laying an egg of about 0.5 kg for a 50 kg adult. This is 10 times larger than reptiles of the same mass, but two Troodon eggs are roughly equivalent to the 1.1 kg egg predicted for a 50 kg bird. Adult Troodons might lay a pair of eggs every one or two days. The embryos had an advanced degree of skeletal development, implying that they were precocial or even superprecocial. An estimation of 45 to 65 total days of adult nest attendance for laying, brooding, and hatching. The young didn’t remain in the nest after hatching and they most likely dispersed like hatchling crocodiles or megapode birds instead.