What mammal has the lowest blood pressure while at rest?

The mammal with the lowest blood pressure while at rest is the giraffe. Due to its tall stature, a giraffe has evolved unique cardiovascular adaptations, including a specialized heart that generates high pressure to pump blood up to its brain. However, when at rest, the blood pressure can drop significantly, making it one of the lowest among mammals. This adaptation is crucial for maintaining adequate blood flow without causing damage to blood vessels in its long neck.