To determine the number of pelicans on the beach after the events described, we can subtract the pelicans that were chased away and add the ones that returned to the initial number.
Initial number of pelicans: 567
Pelicans chased away by Ziggy: 189
Pelicans that returned: 53
Number of pelicans on the beach = (Initial number) - (Pelicans chased away) + (Pelicans that returned)
Number of pelicans on the beach = 567 - 189 + 53
Number of pelicans on the beach = 380 + 53
Number of pelicans on the beach = 433
Therefore, there are 433 pelicans on the beach after Ziggy chased away 189 and 53 of them returned.