The principal rule is development; any characteristic shape that moves itself about is presumably a creature. The other rule is the capacity to eat nourishment; that is, any regular shape that eats and processes sustenance is most likely a creature. There are special cases to both of these standards, as on account of minor types of life, however generally they remain constant.
The enormous set of all animals is separated into gatherings called classes. Fish is one class. Creepy crawlies are another class. We ourselves have a place with the class called well evolved creatures, alongside the stallions, elephants, monkeys and numerous others (warm blooded creatures or creatures that medical attendant their young on drain). Together, the individuals from this set of all animals offer a wondrous assortment of life.
The biggest creatures that have ever lived ashore were the dinosaurs. The greatest dinosaur was more than 100 feet long and different dinosaurs stood 20 feet tall. However, there were different dinosaurs just a foot or so long. Every one of the dinosaurs ceased to exist around 65 million years back. The dinosaurs are named reptiles and are identified with the predecessors of living reptiles like our snakes and crocodiles. Among the biggest living reptiles are the Goliath ocean turtle which might be 8 feet long and the American and Orinoco crocodiles that can grow up to 23 feet long.
The biggest snakes are the pythons and boas which are individuals from a similar family. Among these, the biggest to date would be the South American boa (or the Boa constrictor) that can develop to more than 40 feet long. The biggest feathered creature is the ostrich, which does not fly but rather can run quick. Among the biggest flying creatures are the condors of California and South America. The gooney bird has the biggest wingspan and the male trumpeter swan is the heaviest fledgling at 40 pounds. Indeed, even the American bald eagle does not measure more than 12 pounds.