Part of an ultrasonic ascending arpeggio.
Keeps crocs away.

Code?

gimme a C, a nice, bouncy C

In Australia we've got deadly E animals a plenty.
We've got Ffunnel web spiders who'll murder you and your family.
CUnder every second rock is a Ered back spider.
And they’ll F kill ya just cause, I dunno, they're bored or whatever.

We Cgot invisible brown snakes who'll Ebite you on the foot,
And you’ll be Fdead in seven minutes, like that, kaput.
We've got Cthe world's deadliest creatures all Eover the place.
We've got Fmagpies who'll steal the eyeballs from your face -

But at Amleast we don't have GAR-1F5's.

We've got Cgreat white sharks who'll aEscend from the deep,
And Frip ya in half with their razor sharp teeth.
We've got Csalt water crocs who'll death-Eroll you to death,
and Fsea-snakes who'll gladly snatch your last breath.

We've got a Cblue ringed octopus no Ebigger than this,
that just Fsits around in rock pools waiting to kill kids.
And Ceven the platypus, a cute Ebeaver-duck thing,
has got a Fspur on it’s ankle that’ll kill ya in one sting.

Not La Ropa.

What's really impressive is that there is a healthy enough ecosystem in that estuarine environment to support all those cocodrilos. Brazil must be doing something right (besides throwing corrupt and insurrectionist presidents in jail).