I believe Ip7p is right. I have seen 5 shiny blue beetles while just having 13 ball cacti out.

2 daisy, 2 Rosa, 2 Fragrant, 2 Ven, 1 spotted, 1 bluestar, 1 jalapa, 1 fourpetal and 1 citrus. (with no buds or flowers)

Now 1 after the ball cacti with buds & now 1 after the flowers have come in.