A seal can dive up to 1,000 feet under water. The heartbeat of the seal will slow down between 4 to 15 heartbeats in a minute while under water. This allows the seal to stay longer in the water because it uses less oxygen.
Polar bear
A polar bear is easily found in cold and snowy areas. Its black fur allows a lot of heat to be absorbed. Besides its nose and feet, its whole body is covered by fur. The fur is waterproof but oily. The uniqueness of the fur allows the polar bear to cleanse itself from water and ice easily.
