Collective behaviour of large scale ensembles of agents or particles is ubiquitous in nature. It is often characterized by the emergence of regular spatio-temporal dynamics from a disordered state without any central coordination. Examples include colonies of bacteria, schools of fish, flocks of birds, groups of people, and many more [1, 2]. A popular model to analyse such dynamics is a system of self-propelled particles (SPPs) that align their direction of motion to the average heading in their neighbourhood. This model is known as the Vicsek model [ 3]. Under such an update rule the system either converges to complete alignment or remains in a disordered state. However, many of the experimentally observed collective dynamics do not fall into these two categories. More specifically, regular, coherent and irregular, disordered dynamics are present simultaneously.
A genuine coexistence of dynamical regimes was originally found in networks of non-locally coupled oscillators and called a chimera state [4, 5]. This is a state of the particle system where groups of oscillators are synchronized while other oscillators undergo chaotic dynamics.