Dynamical study of a chaotic predator-prey model with an omnivore A. Al-khedhairi, A. A. Elsadany, A. Elsonbaty and A. G. Abdelwahab Eur. Phys. J. Plus, 133 1 (2018) 29 Published online: 31 January 2018 DOI: 10.1140/epjp/i2018-11864-8