1. Some animals, such as certain species of birds and insects, practice exophagy as part of their natural diet.

一些动物，如某些鸟类和昆虫物种，作为其自然饮食的一部分实行食用泥土等非常规食物。

2. Exophagy is a survival strategy adopted by certain organisms when they cannot find suitable food sources in their environment.

当某些生物无法在环境中找到适合的食物来源时，食用非常规食物是它们采取的一种生存策略。