Answer:
When fully grown, platypuses vary tremendously in size, from just 600 grams (1.3 pounds) to 2.4 kg (5.3 pounds). Males are always much larger than females. On average, females are around 800-900 grams (1.8 - 2 pounds) , and males vary from 1.6 to 2.4 kg (3.5 - 5.3 pounds).