Animals do have their own ceremonial practices. Corvids, particularly crows, do engage in what is widely considered as funeral-like ceremonies when one of their own dies.
Though whether or not the crows actually mourn, or are doing so to assess risks and dangers in the area and learning why one of their own died, only Nevermore could say.
I'll definitely try and keep that in mind, thank you.
I'll try and get something out tomorrow.
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The shenanigans Nevermore could have pulled off with just the corvid ability of mimicry: 