Dolphins: basketball-sized brains
Vultures: acorn-sized brains (well OK, perhaps walnut)
And the shark bit is frackin hilarious. Um, didn't y'all know that proportionately sharks almost never attack humans? Shipping a bunch of sharks to the Red Sea (SEA, mind you) would be spectacularly inefficient.
Which leads me to the main point. Such propaganda is particularly dependent on the ignorance of your audience, which is a specialty of Arab/Persian autocracies: have very ignorant populations who then respond favorably to idiotic scapegoating.