How do you get the key that is guarded by the jumping lizard in the “urchin” area?

Question

I'm in the area full of urchin-like things, where a key is guarded by a jumping lizard. I found the four other keys, but I can't get this one. I tried clicking on the three "urchin-like" plants, in different orders, but I didn't find the solution. Any tips?

I can't post an image here since I'm a new user, but here is the link to the screencap:

Answer 1

Bend the long, red thorn/spine down to the ground so the brown thing hops atop it. Then release it so the brown thing (temporarily) flings away. Now the green urchin can walk away (upon click), and Mr. Feather can fetch the key.