Those particular Tarantula's are terrestrial Tarantula's. There are two kinds of tarantula's. Terrestrial and Arboreal. Terrestrial live in holes on the forest floor, under rocks and shrubs. Arboreal live in tree's and high places.
Those are called Bird Eaters. They can, but don't normally eat birds. It's actually very rare. Tarantulas don't catch prey in webs, they pounce so it would be very hard to catch a bird! Some dumb ass explorer saw 1 eating a bird a hundred years ago and assumed it's what they did. There are two varieties, Theraphosa blondi is the one everyone thinks of. The males can live up to 15 years and females 20+. I owned primarily Arboreal but I did have 2 or 3 Terrestrials.