During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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