[Sebb767]

Probably a person?

If you extend the query [0], the pronunciation seems right (not a speaker, though) and it seems to be a different voice.

EDIT: A sister comment mentioned it is due to it being the end of a sentence. The bug (?) does indeed persist if the word is at the end of a sentence.

[0] https://www.google.com/search?q=rooster+eating+a+pizza+in+sp...

[1] https://www.google.com/search?q=pizza+eating+a+rooster+in+sp...

[wiradikusuma]

Try clicking the speaker icon (to play audio) a few times, it's alternating the voice/accent/tone (I don't know the term).

[pottertheotter]

It's actually just slowing down the audio the second time you click it. I assume so that you can hear the pronunciation a bit better.