After Hunter gatherd the Broccoli's freinds, Broccoli would start to announce "Everyone! i need your help, Mother Hen has lost one of her eggs and we need to start a search party for it. are you all able to do so?"
Seems like something or someone hid the egg where the seeds were for whatever reason, but regardless the egg has been found, so Broccoli and friends returned to Mother Hen to give her the egg back.
Broccoli and his friends noticed her strange behavior
Broccoli was very smart and guessed that she wanted to become a mother
so he suggested preparing a suitable place for the eggs for the hen to sit on