I found junior hanging out with the 'Old Man'. And another critter on this Lobivia bloom.
Cactus and Critters
What are the critters hanging out on the Opuntia? Maybe you should move the praying menace over to the opuntia.
I thimk they were aphids. And that would have been a good idea, but insecticidal soap took care of them before I found the mantis