So, why Harry can talk to snakes? As we learn in "Chamber ... final horcrux (something we'd only find out about in "Deathly Hallows"), Voldemort also gave Harry the gift of Parseltongue.

But as the mystical Deathly Hallows are uncovered, and Voldemort finds out about their mission, the biggest battle begins, and life as they know it will never be the same again.