Make a note of trees, shrubs and perennial plants in your school campus and devote half a day to observe the types of birds which come to the garden. Can you describe the diversity of birds?

Tree is defined as a woody perennial plant having a single stem or trunk growing to a considerable height. It provides habitat for many species of animals. It provides shade and shelter, timber for construction, fuel for cooking and heating.

Shrub is a small or medium sized perennial woody plant having multiple stems and shorter height, less than 6 m tall. They are a source of foodstuffs such as fruits, leaves, shoots and roots. They are also used in landscapes.

Perennial plants are the plant that lives for more than two years. Perennial plants are also known as herbaceous plants.

Types of birds which come to the garden are:

*Parrot

*Pigeon

*Crow

*Sparrow

*Eagle

*Woodpecker

Tropics are home to the greatest biodiversity of birds. Birds are bipedal, warm blooded, and egg laying vertebrates with about 10,000 living species. Birds evolved from theropod dinosaurs 200 to 150 million years ago. Globally, 1,223 species of birds, or about 12 percent of the total of 9,998 extant described bird species, were deemed endangered or threatened with extinction by IUCN’s 2009 Red List. Birds are crucial to maintain the balance of many ecosystems by providing various ecological services.