I fully understand the need to not predate various breeds of birds, and that some would hunt simply for fun. But if you are keeping livestock you should be able to defend it.
I do not go out looking for our local chicken hawks, but if they come knocking on my door I take care of business.
I admire them from afar, and regret killing them, but I am not going to watch them choosing which chick to eat while perching on adjacent trees without reaching for my PCP rifle.
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There is no protection order here,
Although this is not listed as a bird of Grenada, that looks like it could be a Ridgways Hawk which is "critically endangered".
http://www.birdscaribbean.org/category/news/conservation/
The Migratory Bird Act is enforced in Grenada too
https://www.fws.gov/southeast/pubs/facts/glecon.pdf