The spider robots were robots that X.A.N.A. either made or retrofitted within the Jungle Research Facility. They were X.A.N.A.'s only cybernetic monsters. They were first seen in "Lab Rat," but they were only in their tank. They later became a real threat in "Bragging Rights," when Ulrich and Yumi had to fight them to destroy the generator.
They were shown to be able to jump very far, walk on walls and ceilings, and stab with their legs.
The ones that hadn't been destroyed by Ulrich, Odd, and Yumi were incapacitated when the Jungle Research Facility's generators were destroyed.