Conflict
From PinataIsland.info, the Viva Piñata wiki
Sour pinatas and ruffians aren't the only cause of trouble in your garden. Each pinata has its own little quirks, and doesn't always get along well with others. Some pinatas simply dislike another particular species. Others may fight over land and resources. Each species has its own unique attack that comes into play. For example Fizzlybears will spit puzzle pieces when they get angry.
Some solutions to help resolve these quarrels include: