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There are positive changes that should be implemented in the rearing of animals.

应该积极改变动物的饲养方式。

《柯林斯英汉双解大词典》

These animals were not as sensitive to climate changes in the Cretaceous period as they are today.

这些动物在白垩纪对气候变化不像今天这样敏感。

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He said small changes took place in individual animals.

VOA: special.2009.02.25

For a great many years evolution was conceived as being driven externally by environmental pressures and internally by mutations in DNA. Mutations in the DNA created genetic diversity and when there were changes in the environment, those animals with the mutated DNA were sudden in a more favorable position.

FORBES: The Fossils in Our Genes

Few of the changes in the handling and presenting of animals would be possible had great progress not come in veterinary care.

ECONOMIST: From zoo cage to modern ark

They also found changes in the mix of cells within the animals' immune system itself.

ECONOMIST: Social status and health