You summon a Black Bear (which the DM has stats for) bear to appear at a point within range. It acts on its own accord, and does not obey you or your commands.

At Higher Levels. When you cast this spell using a spell slot of 2th level or higher, you summon one additional bear for each level above 1st. If you cast this at 3rd level, you summon Brown Bears instead of Black bears. If cast at 4th or higher, you summon Polar Bears or Cave Bears, which you choose when you cast the spell.