You can see the rounded tail of this platypus

They are a lot smaller than you would imagine, an adult platypus is from 45 cm to 60 cm in length and may weigh up to 2.7 kg, with females generally smaller than males.
The platypus with its duck bill (which is actually soft and pliable) and webbed feet, is a unique Australian animal. It and the two species of echidna are the only monotremes or egg-laying mammals to be found on earth. Monotremes have lower body temperatures than other mammals and have legs which extend out, then vertically below them. These features together with their egg-laying are more like that of a lizard than a mammal.