Use "feistier" in a sentence

1. Allas Sak picks up where Dungen’s previous album left off, but somehow it sounds bolder and livelier, feistier yet more focused

2. Despite impressions of class and elegance, Avocets display a feistier side during the nesting season, with adults shrieking and dive-bombing passing crows or harriers, or mobbing fellow wading oystercatchers and redshanks.