I have had every miss size possible. I always order by weights now. The issue is there is no consistent size. I have one supplier whom says small rats are around 40gm and the other whom say around 90 is a small. I have on occasion ordered small rats from both one for sub adult snakes the other for adults. The terms are subjective and not fixed weights are basically absolute and not open for interpretation.

On a side note Royals often love chicks. The Italian predator studies show smaller royals eating birds frequently, and in trees after the small birds.