Cows have best friends
Studies of dairy herds show cows form close bonds with particular partners and show measurable stress — higher heart rate and cortisol — when separated from them.
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See all →Octopuses have three hearts and blue blood
Two hearts pump blood through the gills and one pumps it around the body. Their blood is blue because it uses copper-based haemocyanin instead of iron-based haemoglobin to carry oxygen.
Read the fact →Elephants are the only mammals that cannot jump
With four to six tonnes to carry, an elephant always keeps at least one foot on the ground. Even at full speed its gait is a fast walk, not a run.
Read the fact →Sea otters hold hands while they sleep
They float on their backs in groups called rafts and hold paws so they do not drift apart on the current. They also wrap themselves in kelp as an anchor.
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