Having trouble viewing the video but what's blowing my mind right now is that in the picture I see, it has created a decoy with 8 legs. How does it know??
The writer/editor chose that picture. Scroll down and there's a 5-legged decoy. It's still cool, but they chose the most impressive picture to lead with.
Looks like it. If one clicks through to the blog post, there are photos of two more decoys, both with <8 legs. But I guess most predators don't stop to count legs, so the evolutionary pressure for better decoys isn't that high.
