I'd want to knock it out for the reasons stated (study, etc)
What is true is that ONE of something implies MANY of something, and you want to know what might be coming next - is this a full grown adult, is it a juvenile, is it related to anything we have encountered before etc.
If sedation failed, I'd suggest a fuel/air bomb - if it has lungs that would at least stun it, and if it breathes through its skin, it should dry the thing out a fair bit.
I's also want to ensure that I tried to herd it towards the less populated and useful parts of the environment - if you do knock it down, having it fall on your downtown area would be a bugger.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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