The Fatal Eggs the pre-plague level. However, the chicken eggs which are imported from outside the country are, by a mistake, sent to Persikov's laboratory while the reptile eggs destined for the professor end up in the hands of the farmers. As a result, Rokk breeds an enormous quantity of large and overly aggressive snakes, ostriches, and crocodiles which start attacking people. In the panic that follows, Persikov is killed by a mob — which blames him for the appearance of the snakes — and his cameras are smashed. The Red Army attempts to hold the snakes back, but only the coming of
Largest prehistoric animals "Argentavis magnificens" which a wingspan of , and a body weight of . The largest-known waterfowl of all time belonged to the Dromornithidae (e.g. "Dromornis stirtoni"). The largest-known of Ciconiiformes was "Leptoptilos robustus", standing tall and weighing an estimated . The largest-known of the hesperornithines was "Canadaga arctica" at long. The largest-known diatryma was "Gastornis" tall, with large individuals up to tall. The largest-known teratorn and the largest flying bird ever was "Argentavis". The immense bird had a wingspan estimated up to and a weight up to . It was as high as an adult human when standing. The largest-known-ever