Some of these systems exhibit chaotic behaviour: their state at some future time can not be predicted from their state at an earlier time, because imperceptible differences that exist now can cause big divergences later. (scientificamerican.com)
«A dynamical system such as the climate system, governed by nonlinear deterministic equations (see Nonlinearity), may exhibit erratic or chaotic behaviour in the sense that very small changes in the initial state of the system in time lead to large and apparently unpredictable changes in its temporal evolution. (judithcurry.com)
«Watching nature red in tooth and claw is certainly one way to see counterintuitive, chaotic behaviour rear its ugly head,» writes Casti. (newscientist.com)