Frogs are both land and water creatures that keep the environment in balance by acting as both predators and prey.
Earth Day is an annual event scheduled for April 22 to show support for environmental protection.
World Tourism Day's purpose is to raise awareness on the role of tourism within the international community and to demonstrate how it affects social, cultural, political and economic values worldwide.
The peace dove flying with an olive branch in its beak is one of the most commonly featured symbols for the day.
