Tacky Glue (or elmers)
For Caterpillars you need a needle and thread as well.
The feet are just hearts I cut out. I left Bear assemble them and I did the glue dabbing. For the caterpillar just use a needle the thread the pom poms in a line, when it is as long as desired run the thread through the opposite direction and tie the ends (they make nice antennae)
Good craft for before dinner - they are done drying after you eat.