Noida is home to India's largest unicorn startup Paytm, a financial services company with multiple ventures including eCommerce, mutual-fund investments, utility bill payments and person-person payments. Culture/Cityscape Parks and recreation in Noida Okhla Bird Sanctuary Okhla Bird Sanctuary (OBS) is at the entrance of the city at the point where the Yamuna River enters the state of Uttar Pradesh from the state of Delhi. The Okhla Barrage over the Yamuna has created the unique position of the OBS which attracts various species of birds. OBS is among the 466 important bird areas in India. About 324 various bird species are seen in the sanctuary, about 50% of which are migratory birds. Noida's botanical garden Noida's botanical garden was formed with the aim to turn it into a hub of special and endangered plants, representing the entire country. which is located in Sector 38A of the city, started in 2002. Today, it sprawls across 160 acres, There are around 7,500 plants in the garden. The garden has a seed bank, where seeds of more than 250 plant species are conserved. It also features a map of India, made entirely from plants. Scientists are giving a new lease of life to endangered and extinct plant species at the Botanical Garden. A look around the green expanse reveals species like Psilotum Nudum, better known as skeleton fork fern. Considered a "primitive" plant – a descendant of possibly the first group of vascular plants from 400 million years ago – that was widespread during the Devonian and Silurian periods – its name means "bare naked" in Latin as it lacks most of the organs found in plants species that evolved later. Noida's botanical garden is divided into 10 sections. The "medicinal plants" section has an astounding variety of 96 plants and is further divided into eight sections named after the parts of the human body they benefit. For example, the "digestive system" section has aloe vera and Gymnema sylvestre (madhunaashini), which treats diabetes. The "blood and circulation" section has Withania somnifera (Ashwagandha) and Aristolochia indica (Isharmul) – blood purifiers. The "musculo-skeletal" section has Cissus quadrangularis (Hadjod); "skin disease" section has Plumbago zeylanica (Chitarak) which cures leucoderma. Noida's botanical garden has a large fruit section which has many varieties of mango, pomegranate, lemon, pear, plum, mulberry, etc., besides their speciality the black guava. The woodland section is equally impressive with trees like Sapindus Emarginatus (Reetha),