You could find the awsner for your question without asking here, but
oh well...
The Kiwis appear at level 70 (without the PD's), and they drop mines that become invisible until you step on them, and you can avoid it two ways:

Run away from the mine

Kick the mine (but don't run in the same direction you kicked it)
They can move like bananas (jump small ledges, jump up or down).
At level 70 there are 4 kiwis, and when they are killed, a

and some yellow

appear.