That's why they are called "Flytraps"

[Not a Number]

Left to their own devices my Dionaea grown outdoors catch two or three insects per plant per growing season - flies, spiders, earwigs are standard fair. Once in a great while a crane fly or honey bee gets caught.

This 'Justina Davis' is an over-acheiver:

Maybe the lack of red coloration is an advantage?

 

[Wolfn]

Maybe the lack of red coloration is an advantage?

I've always heard that the red on the flytraps attracts insects, similar to the reason why flowers are brightly colored.

 

[Kayota]

My VFT is getting some great red coloration for only having sunlight as a factor, and I suspect it's because it's catching so much this year. Darn thing is growing like a weed.

 

[Clue]

Not a Number: My 'Justina Davis' does an excellent job with flies, wasps, and the occasional honeybee as well. It is the only flytrap who has ever caught 3-4 flies per trap that I have owned.

 

[mmlr38]

I have not noticed any difference in the number of insects caught between the all green varieties (Justina Davis and Grun) than the rest of my plants.