Columbian drug-lord Pablo Escobar kept four Hippos in his estate before his death in 1993. Deemed too much hassle to move by authorities, his Hippos were left there and have since bred and escaped becoming an invasive species of Columbia.

Some dogs can predict when a child will have an epileptic seizure, and even protect the child from injury. They're not trained to do this, they simply learn to respond after observing at least one attack.

The largest land based mammals on Earth are elephants.

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