The females in the same population have the same throat colours, and this affects how many offspring they produce and the size of the progeny, which generates cycles in density, yet another game - the r-K game. Here, r is the Malthusian parameter governing exponential growth, and K is the carrying capacity of the population. Orange females have larger clutches and smaller offspring and do well at low density. Yellow females (and blue) have smaller clutches and larger offspring and do better when the population exceeds carrying capacity and the population crashes to low density. The orange then takes over and this generates perpetual cycles of orange and yellow tightly tied to population density. The idea of cycles due to density regulation of two strategies originated with Dennis Chitty, who worked on rodents, ergo these kinds of games lead to "Chitty cycles". There are games within games within games embedded in natural populations. These drive RPS cycles in the males with a periodicity of four years and r-K cycles in females with a periodicity of two years.