What should be included in health certificates for animal travel?

The inclusion of environmental temperature limits in health certificates for animal travel is crucial because it ensures the welfare of the animals during transport. Temperature limits provide guidelines to prevent overheating or hypothermia, which can significantly affect an animal's health and safety. These limits help transporters adhere to appropriate conditions while providing care and ensuring the animals are not exposed to detrimental environmental factors that could lead to stress or illness.

While the other options mentioned, such as owner’s contact details, transportation details, and vaccination history, are also important for various reasons, they do not directly address the specific conditions related to the animals’ immediate environmental needs during travel. Each of these elements contributes to the overall documentation and welfare of the animal, but environmental temperature limits are particularly essential for maintaining health and safety in transit situations.