One does not use a platypus for anything. One allows it to live in peace in the wild.
A platypus is an interesting creature.
You would not use a platypus anywhere. However, you might encounter one in Australia.
No, the platypus is the only species. It is not actually known as the duck-billed platypus: this is just a nickname which only non-Australians use.
No. Platypuses do not use mimicry of any description.
to swim and
Yes. The platypus is a mammal and all mammals have lungs. Even marine mammals such as dolphins and whales must use lungs to breathe. When swimming, the platypus must surface regularly to breathe.
The playtpus swam in the river.
to swim more efficiently
The platypus uses its sharp claws (with retractable membranes) to dig a burrow in a riverbank or creek bank.
There is no need for anything in particular to be done to protect the platypus. The platypus is not endangered. There was a time when it was under threat, being particularly prized for its fur years ago. Now, platypus numbers have returned to essentially the same levels they were prior to European settlement. The Australian Government lists the platypus as "common but vulnerable". The International Union for Conservation of Nature lists the platypus as "least concern". Platypuses are now strictly protected by law. There are also laws prohibiting the use of fishing nets in freshwater creeks and rivers. The use of these nets used to be a major contributor to platypus deaths.
a platypus's bill is a bill that is on a platypus
a platypus's bill is a bill that is on a platypus