More than 400 goats, along with a number of sheep, are back in Pflugerville to help clear unwanted vegetation from parks and greenbelts across the city. The animals arrived this week and will spend about eight weeks grazing in areas that can be difficult to maintain with traditional equipment, including creek beds, steep slopes, and uneven terrain. The herd eats grass, overgrown brush, poison ivy, and other vegetation, reducing the need for chem…