Giant water lilies: Found in Guyana, these lily pads grow up to 10 feet in diameter and hold 110 pounds.
Courtesy Guyana Tourism Authority
Whale sharks: Found in tropical oceans such as the Gladden Spit Marine Reserve in Belize between March and June and Ningaloo Marine Park in Western Australia between March and August, this shark is endangered.
Phil Rudin
Leatherback sea turtle: These turtles migrate up to 10,000 miles a year to search for food and nesting grounds. Nesting season is when you're most likely to see them.
Courtesy Guyana Tourism Authority
Gorillas: Critically endangered eastern gorillas are the largest living ape and primates on the planet.
Marcus Westburg
African elephants: Botswana is home to the largest number of elephants in the world with a population of 130,000, making it the best place to see African elephants.
Brave Africa
Rafflesias: This flower is native to the rainforest of Sumatra, Indonesia. They can also be found in Thailand, the Philippines and Malaysia.
Riau Images/Barcroft Media/Getty Images
Komodo dragons: The endangered lizards (lthe largest lizard species still roaming the Earth) live in Indonesia, and can be seen only at Komodo National Park.
Wolfgang Kaehler/LightRocket/Getty Images
Red kangaroos: These kangaroos are found in the semi-arid and arid regions of mainland Australia.
Echidna Walkabout Nature Tours
Saltwater crocodiles: The largest population of wild these creatures can be found in Australia in Kakadu National Park and Nitmiluk National Park.
Nicholas Kavo/Tourism Australia
Blue whales: The oceanic giants can swim 20 miles an hour but usually traverse at about five miles an hour.
Columbus Tours
Emperor penguin: Residing in Antarctica, these are the world's largest penguins at an average of 45 inches tall (114 centimeters).
K. Ovsyanikova
Polar bears: The bears have webbed feet and are considered marine mammals. They've been listed under the US Endangered Species Act as threatened because of predicted climate change since 2008.