PS: If so, then why not the human casualties, who were found after the wave slowly receeded? Once drowned, they were found were they were laid by the waters, already dead. IMO, you misunderstand the entire dynamic.
Sorry, nothing personal.
They either went to higher ground, or were swept out to sea and swam back, or were swept out to sea and neither swam nor floated back, or larger ones were not easily moved from their places, or smaller ones are already buried in sand and debris, or the reports are wrong, or some combination. I think that exhausts the cases, and if so, the preceding statement must be true, tautologically.
It's inaccurate to claim I misunderstand the dynamic. I just suggested an additional case. I DON'T understand what dynamic would result in other creatures being disposed differently. That's a different thing.
I speculate that anything we have heard so far is speculative, not that there is the least thing wrong with that. ;-)