Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
7
Domestic pigs average a top speed of about 11 miles per hour.
182
15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
1
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6