Volume 1: 1 Ant Colony Optimization Pushpendra Singh, Nand K. Meena, Jin Yang, and Adam Slowik 2 Artificial Bee Colony Algorithm Bahriye Akay and Dervis Karaboga 3 Bacterial Foraging Optimization Sonam Parashar, Nand K. Meena, Jin Yang, and Neeraj Kanwar 4 Bat Algorithm Xin-She Yang and Adam Slowik 5 Cat Swarm Optimization Dorin Moldovan, Viorica Chifu, Ioan Salomie, and Adam Slowik 6 Chicken Swarm Optimization Dorin Moldovan and Adam Slowik 7 Cockroach Swarm Optimization Joanna Kwiecien 8 Crow Search Algorithm Adam Slowik and Dorin Moldovan 9 Cuckoo Search Algorithm Xin-She Yang and Adam Slowik 10 Dynamic Virtual Bats Algorithm Ali Osman Topal 11 Dispersive Flies Optimisation: A Tutorial Mohammad Majid al-Rifaie 12 Elephant Herding Optimization Nand K. Meena, Jin Yang, and Adam Slowik 13 Firey Algorithm Xin-She Yang and Adam Slowik 14 Glowworm Swarm Optimization - A Tutorial Krishnanand Kaipa and Debasish Ghose 15 Grasshopper Optimization Algorithm Szymon Lukasik 16 Grey Wolf Optimizer Ahmed F. Ali and Mohamed A. Tawhid 17 Hunting Search Algorithm Ferhat Erdal and Osman Tunca 18 Krill Herd Algorithm Ali R. Kashani, Charles V. Camp, Hamed Tohidi, and Adam Slowik 19 Monarch Butterfly Optimization Pushpendra Singh, Nand K. Meena, Jin Yang, and Adam Slowik 20 Particle Swarm Optimization Adam Slowik 21 Salp Swarm Optimization: Tutorial Essam H. Houssein, Ibrahim E. Mohamed , and Aboul Ella Hassanien 22 Social Spider Optimization Ahmed F. Ali and Mohamed A. Tawhid 23 Stochastic Diffusion Search: A Tutorial Mohammad Majid al-Rifaie and J. Mark Bishop 24 Whale Optimization Algorithm Ali R. Kashani, Charles V. Camp, Moein Armanfar, and Adam Slowik Volume 2: 1 Ant Colony Optimization, Modifications, and Application Pushpendra Singh, Nand K. Meena, and Jin Yang 2 Artificial Bee Colony - Modifications and An Application to Software Requirements Selection Bahriye Akay 3 Modified Bacterial Forging Optimization and Application Neeraj Kanwar, Nand K. Meena, Jin Yang, and Sonam Parashar 4 Bat Algorithm - Modifications and Application Neeraj Kanwar, Nand K. Meena, and Jin Yang 5 Cat Swarm Optimization - Modifications and Application Dorin Moldovan, Adam Slowik, Viorica Chifu, and Ioan Salomie 6 Chicken Swarm Optimization - Modifications and Application Dorin Moldovan and Adam Slowik 7 Cockroach Swarm Optimization -- Modifications and Application Joanna Kwiecien 8 Crow Search Algorithm - Modifications and Application Adam Slowik and Dorin Moldovan 9 Cuckoo Search Optimisation -- Modifications and Application Dhanraj Chitara, Nand K. Meena, and Jin Yang 10 Improved Dynamic Virtual Bats Algorithm for Identifying a Suspension System Parameters Ali Osman Topal 11 Dispersive Flies Optimisation: Modifications and Application Mohammad Majid al-Rifaie, Hooman Oroojeni M. J., and Mihalis Nicolaou 12 Improved Elephant Herding Optimization and Application Nand K. Meena and Jin Yang 13 Firey Algorithm: Variants and Applications Xin-She Yang 14 Glowworm Swarm Optimization - Modifications and Applications Krishnanand Kaipa and Debasish Ghose 15 Grasshopper Optimization Algorithm - Modifications and Applications Szymon Lukasik 16 Grey wolf optimizer _ Modifications and Applications Ahmed F. Ali and Mohamed A. Tawhid 17 Hunting Search Optimization Modification and Application Ferhat Erdal, Osman Tunca, and Erkan Dogan 18 Krill Herd Algorithm -- Modifications and Applications Ali R. Kashani, Charles V. Camp, Hamed Tohidi, and Adam Slowik 19 Modified Monarch Butterfly Optimization and Real-life Applications Pushpendra Singh, Nand K. Meena, and Jin Yang 20 Particle Swarm Optimization Modifications and Application Adam Slowik 21 Salp Swarm Algorithm: Modifications and Application Essam H. Houssein, Ibrahim E. Mohamed , and Aboul Ella Hassanien 22 Social Spider Optimization -- Modifications and Applications Ahmed F. Ali and Mohamed A. Tawhid 23 Stochastic Diffusion Search: Modifications and Application Mohammad Majid al-Rifaie and J. Mark Bishop 24 Whale Optimization Algorithm _ Modifications and Applications Ali R. Kashani, Charles V. Camp, Moein Armanfar, and Adam Slowik