...Because, dear child, they eat Shrimp. Fact from www.snapple.com.

#31: The Average human will eat up to eight spiders while sleeping
#38: Fish Cough
#48: Cats can hear Ultrasound
#59: Brain Waves can be used to power an electric train
#84: Oysters can change gender back and forth
#92: Fish can drown
#98: When the moon is directly over you, you weigh less
#108:Licking a stamp burns 10 calories
#122:A duck cannot walk without bobbing it's head

and there are many more!