What is the bright twinkling star in the southern sky?

I was on an island off the coast of Belize from February 13 through the 17th. Each night at around 9 or 10pm CST there was a very bright star just above the horizon in the southern sky. It twinkled, changing color constantly from red to blue to green and back to red again. Orion was almost directly above, and just a little to my north. Does anyone know what it may have been? I think maybe Sirius, but don't know for sure.|||The 3 stars in orion's belt point south to Sirius. Below Sirius just above the horizon is Canopus. It would twinkle with color because it is low in the sky - Sirius is quite a bit higher and is usually a fairly steady blue white. If the belt pointed to it, it was Sirius, but at that latitude, near the horizon - it was probably Canopus. This is how things would look about 8 pm Belize time|||Yes, it is Sirius. It is one of the closest stars to our Sun (a little over 8 light years away) and very luminous. Because of this, scintillation has a profound effect on the light it emits, making it appear to have many different colours.