To reduce water loss, animals, e.g. camel and kangaroo rat, sweat and very little or not at all.

To reduce water loss, certain animals like camels and kangaroo rats have adapted to their harsh environments by minimizing the amount they sweat or not sweating at all. Here's how:

1. Adaptation to Environment: Both camels and kangaroo rats live in arid environments where water is scarce. To survive, they have evolved to minimize water loss. One way they do this is by reducing the amount they sweat.

2. Body Temperature Regulation: Instead of sweating, these animals have other ways to regulate their body temperature. Camels, for instance, can change their body temperature threshold throughout the day, allowing them to withstand higher internal temperatures before they start to sweat.

3. Water Conservation: Kangaroo rats have an extremely efficient kidney function that minimizes water loss through urine. They also get most of their water needs from the seeds they eat, reducing the need to drink water.

4. Nocturnal Lifestyle: Kangaroo rats are mostly nocturnal, meaning they are active at night when temperatures are cooler. This reduces their need to sweat to cool down.

5. Insulating Body Features: Camels have a thick coat of fur which insulates them from the intense heat, reducing the need for sweating to cool down.

In conclusion, these animals have adapted to their environments in ways that minimize water loss, including sweating very little or not at all.