getMonkey.php

<?php

class AnimalParade
{
  private function getMonkey()
  {
    try {
      return $dataSource->wrangleAMonkey();
    } catch (NotFoundException $e) {
      // The null object pattern, quick and dirty-like
      return new class() extends Animal {
        public function soundOff()
        {
          echo "Pretend to be a monkey.";
        }
      };
    }
  }
}