Find the link

[Winnie57]

This should be in puzzle thread but will have forgotten the idea by the time I've got one right. Maybe it could become a thread in its own right if people like the idea. Whoever gets it right could post four more pictures with a link.

What is the link between these four pictures?

[Winnie57]

That's a clever guess but not the answer unfortunately. I'll give you a BIG clue:

Six legs