bmw is correct it is a red lored amazon
http://zachary.avianavenue.com/WorldAmazons.html
the bird doesn't look very young. if it bites take it back, it won't get any better, unless you have lots of experience with parrots.
remember parrots don't find that many seeds in the jungles, so they scavenge for fruit or vegetables or meat from some dead bird. they like cooked chicken,and they can eat a chicken leg bone, but never raw. corn on the cob gives them something to eat and play with at the same time. get a good mixture of seed also, something like kaytee and fresh water every day.
if you live near eucalyptus trees, cut some pieces of different thickness about 4 or 5 inches long. the birds like to chew.