to be honest teens only learn the hard way. I be she won't put her face up there again! she is ver very lucky that is the only damage that she got! 7 stitches is nothing! My U2 cased nerve damage in my thumb, bruised the bone as well as I should have gotten lots of stitches( but I didn't go)! my thumb is still numb in spots and that happened 4 months ago. AND I just got bit again on Thursday! I will be 34 years old this month...and you think I would have learned by now. My thumb area swelled up 5 times the normal size and it is still a little bigger than it ever has been.
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In time you will pick up on cues that she is going to bite! It will just take time and lots of observation to learn the signs!
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"Humans are the only animals that are mean on purpose"
Teal- Blue and Gold Macaw
Ellie - Mollucan/umbrella cockatoo hybrid