Original sentence: According to the United States Fish and Wildlife Service, the site is home to "1,200 plants, 300 butterflies, and approximately 700 vertebrates", with at least 520 bird species.Brownsville has 37 individual parks.The Boca Chica State Park and Brazos Island State Park were state parks that were transferred to the Lower Rio Grande Valley refuge center in 2007 in separate lease agreements.The agency purchased  of the site's land, with two-thirds belonging to private landowners.The city also houses three gymnasiums, two public pools and 55 athletic fields.The refuge contains trails that are connected to the Great Texas Coastal Birding Trail
Edited sentence: According to the United States Fish and Wildlife Service, the site is home to "1,200 plants, 300 butterflies, and approximately 700 vertebrates", with at least 520 birds species.Brownsville has an extensive park system, with over 37 individual parks.The Boca Chica State Park and Brazos Island State Park were previously state parks that were transferred to the Lower Rio Grande Valley refuge center in 2007 in separate lease agreements.The agency purchased  of the site's land, with two thirds belonging to private landowners.The city also houses three gymnasiums, two public pools as well as 55 athletic fields.The refuge contain trails that are connected to the Great Texas Coastal Birding Trail