also called Duck-billed platypus, Duckbill

2 views: its portrait, and how it looks in the comparison photos.
About
The platypus is a small, egg-laying mammal from Australia that is roughly the length of a house cat.
People often expect the platypus to be as large as a beaver or an otter, but it is much smaller in reality. Males are noticeably larger than females, usually weighing about a third more. Along with echidnas, it is one of the only living monotremes, sharing a compact, low-slung body shape built close to the ground.
From Wikipedia
The platypus, sometimes referred to as the duck-billed platypus, is a semiaquatic, egg-laying mammal endemic to eastern Australia, including Tasmania. The platypus is the sole living representative of the family Ornithorhynchidae and genus Ornithorhynchus, though a number of related species appear in the fossil record.
Read more on Wikipedia →Text from Wikipedia’s “Platypus” article, CC BY-SA 4.0.
1 on the site
Weight
3.31 lb (1.5 kg)
Quick answer
A platypus is about 20 inches (0.5 m) long, stands roughly 4.7 inches (0.12 m) tall, and weighs around 3.3 pounds (1.5 kg). This makes it considerably lighter and lower to the ground than an average domestic cat.
Typical figures, the same ones every comparison on the site uses; real ones vary.
More animals
Compare it
Next to anything: a person, a car, another thing.