Now there's a third way that octopus can transform themselves to blend in with or mimic their environment, and that's by changing their shape and size, at least their apparent size.

现在有第三种方式可以让章鱼改变自己，以融入或模仿它们所处的环境，那就是改变它们的形状和大小——至少是在表面上改变自己的大小。