They don't appear until the child reaches 2 to 6 years of age. Banging your head against a wall uses 150 calories an hour. Butterflies taste with their feet. Cats have over one hundred vocal sounds, dogs only have about ten. Cat's urine glows under a black light.
China has more English speakers than the United States.
Donald Duck comics were banned in Finland because he doesn't wear pants. Dueling is legal in Paraguay as long as both parties are registered blood donors. Elephants are the only animals that can't jump. February 1865 is the only month in recorded history not to have a full moon. Humans and dolphins are the only species that have sex for pleasure.