When I was in Australia a couple of years ago I came across a spider ant, which is a species of ant which mimics a spider. I'd heard that there are also spiders which mimic ants, and lo and behold when I was in Cuc Phuong national park near Hanoi I happened across one! You can see that it's captured the shape of the ant body perfectly, and even the stripes on the belly. Since then, I've also come across an ant mimic jumping spider in Thailand and one in Cambodia called the ant-like crab spider. I'm not really sure why a spider would want to mimic an ant, unless it makes it easier to sneak up on prey. For that matter, I'm not sure why an ant would want to mimic a spider, either - most animals avoid ants because of their powerful bites, so I can't imagine that it gets much protection from pretending to be something else which is also dangerous. I saw a couple of other interesting bits of mimicry while in Vietnam, including a very small spider which deliberately placed pieces of detritus in the middle of its web and then sat amongst it to make itself seem like just another piece of trash. There was also a small jumping spider which lay flat on a leaf and bent its abdomen to the side, probably to appear like a bird dropping, a trick also adopted by a moth I saw in Cuc Phuong. And while we're on the topic of moths, I came across one in - of all places - the bus at Cam Ranh bay which was ferrying passengers from the plane I'd just landed in to the terminal. What was unusual about this moth was that it was mimicking a hairy brown spider, with a large hump on its back in the shape of a spider's head, complete with dark "eyes".