I was playing with my two babies this evening and I was making a whistling noise at them like they make to each other. Both of them stopped what they were doing, cocked their heads, and looked directly at me, almost like they were understanding/listening to me. Then one of them came up to me and bit me on the nose and finger and drew blood from both. This is very unusual behavior for him. I've had him for two years and he has NEVER drawn blood. What does it mean?? Did I do something bad??

Wow....sounds like you discovered a powerful glider insult. :-)
Can you get an audio file of the exact whistle?

The R-word...
r o d e n t (!!!!)

I definitely will not make that sound then..lol

I don't think I would be using that sound with them again. Maybe you called him fat or something?

We humans may never understand the whims of a suggie

Maybe you got the inflection wrong and insulted his mother :')