Any thought that the tube feeding (if thats what you were doing) went into the lungs rather that oesophagus??? I am not casting any doubt on your technique, but I have intubated birds (and some reptiles) in the past and it can be tricky. Accidents occur and I have killed a few things. Inspiring water or food into lungs might lead to either pneumonia/ breathing issues and infections.
Just my 2 cents worth.
Rob.
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