In Baltimore, Maryland, it's illegal to take a lion to the movies.

Earth Day is celebrated in more than 175 countries.

After Christmas and Halloween, Earth Day is the largest celebrated holiday in schools.

Recycling one aluminum can saves enough energy to watch TV for three hours –the equivalent of a half gallon of gasoline.

More than 20 million Hershey's Kisses are wrapped each day – 133 square miles of tinfoil. All that foil is recyclable.

The patron Saint of ecologists (and animals) is St. Francis.

The Peace Bell, made from coins donated by school-children to further peace on our planet, is rang every Earth Day at the United Nations.

More than 100 billion plastic bags are thrown away each year in the U.S., the equivalent of dumping 12 million barrels of oil.

More than 1 million birds and 100,000 marine mammals and sea turtles die each year from plastic bags waste.

If all U.S. households installed water-efficient appliances, we would save more than 3 trillion gallons of water and more than $18 billion per year.

Plastic doesn’t biodegrade so it can persist for centuries. All the plastic that has ever been made on earth is still around and will exist long after we’re gone.

In 2007, 56 percent of the paper consumed in the U.S. was recovered for recycling — an all-time high. That’s nearly 360 pounds of paper for each man, woman, and child.

Mammals are the only creatures that have flaps around their ears.

Denmark has twice as many pigs as people.

A South American Giant Anteater eats over 30,000 ants per day.

Blue Whales can weigh up to 200 tons. That's about eight DC-9 aircrafts set end-to-end.

~ National Geographic

About 100 people can fit in the mouth of a blue whale.

~ National Geographic

The heartbeat of a blue whale can be detected from two miles away.

~ National Geographic

A human could easily crawl through the major arteries major arteries of a blue whale.

~ National Geographic

Blue whales can produce sounds louder than a jet engine (188 dB vs. jet engine's 140 dB) and can communicate with other whales up to 1,000 miles away.

~ National Geographic

A crocodile's tongue is unmovable, as it is attached to the roof of its mouth.