Question

now the worker ants wait. they need help. soon other ants come. they bring worms that have hatched from ant eggs.
each ant taps and squeezes its worm. the worm makes sticky spit. the spit is like glue. it sticks the leaves together. leaves and spit make a good nest.
an ant squeezes a worm.
what do the ants the hatched eggs?
worms
birds
leaves

Explanation:

The text clearly states that the ants use the worms (by tapping and squeezing them to get the sticky spit) to help build the nest. There is no mention of birds being used in any way related to the hatched eggs in the context of nest - building. Leaves are the material that the sticky spit (from the worms) sticks together, not something that the ants "use" the hatched eggs for in the sense of the question.

Answer:

worms