This is the 5909th most frequent Portuguese word.
besouro
Beetle.
Here, 'besouro' refers to the insect commonly known as beetle.
Um besouro pousou na minha janela.
A beetle landed on my window.
In this case, 'besouro' again denotes the insect, emphasizing its characteristic sound during flight.
O som do besouro voando é muito único.
The sound of the beetle flying is very unique.
Within this context, 'besouros' is used to refer to beetles in a biological and ecological research sense.