Song 1 by Mr Physicson

Question

Mr Physicson has a good day in his lab today, so he went back home a bit tired but in joy in the afternoon. His little son wanted him to sing a song, so Mr Physicson gladly started chanting:

A quintet of primates, with a size less than the arbitrary reader's conception of average, were performing movements rich in oscillations on the perennial photosynthetic eykaryote,

also causing provocation on the local lizard apex predator on terms of being able to secure its sustenance in the form of themselves...repeatedly, as the poetic structure demands.

What was unexpected was the latter's utilization of stealth, especially concerning acoustics,

and thus responded to the provocation by succeeding in separation of one of the former from its mentioned habitat.

Of course, we all know Mr Physicson get a bit too science-y at times. Can you figure the song out?

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Some backstory: I encountered a similar riddle, in my own language, in the board game Mindtrap. It is not the hardest type of puzzle, but I found it hilarious! What I don't know, and had to guess, about this, is if the song is popular (it should be) and if -son is a pretty common English name suffix. I googled as much as I could to get these correct.

Answer 1

This is a 'scienced-up' version of:

The nursery rhyme Five little monkeys swinging in a tree!

A quintet of primates, with a size less than the arbitrary reader's conception of average, were performing movements rich in oscillations on the perennial photosynthetic eykaryote,

"Five little monkeys swinging in a tree...

also causing provocation on the local lizard apex predator on terms of being able to secure its sustenance in the form of themselves...repeatedly, as the poetic structure demands.

Teasing Mr. Crocodile: "You can't catch me!"...

What was unexpected was the latter's utilization of stealth, especially concerning acoustics,

...along comes Mr. Crocodile as quiet as can be...

and thus responded to the provocation by succeeding in separation of one of the former from its mentioned habitat.

...aaaaand SNAP!"

Phrase by phrase:

A quintet (FIVE) of primates (MONKEYS), with a size less than the arbitrary reader's conception of average (LITTLE), were performing movements rich in oscillations (SWINGING) on the perennial photosynthetic eykaryote (IN THE TREE),

also causing provocation (TEASING) on the local lizard apex predator (MR. CROCODILE) on terms of being able to secure its sustenance in the form of themselves... ("YOU CAN'T CATCH ME!") repeatedly, as the poetic structure demands. (THE SONG REPEATS WITH DECREASING NUMBER OF MONKEYS EACH TIME...)

What was unexpected was the latter's utilization of stealth, especially concerning acoustics, (ALONG COMES MR. CROCODILE, AS QUIET AS CAN BE)

and thus responded to the provocation by succeeding in separation of one of the former from its mentioned habitat. (AAAAAND SNAP! HE PULLS THE MONKEY OUT OF THE TREE!)

Here is a web page showing the lyrics and video if you want to experience the SHEER DRAMA of how it all pans out!