Simplify the following text for a Grade 9 native English-speaking person.
Original: Another shared feature is that , unlike most ant species , army ants do not construct permanent nests ; an army ant colony moves almost incessantly over the time it exists . All species are members of the true ant family , Formicidae , but there are several groups that have independently evolved the same basic behavioral and ecological syndrome .
Simplified: All army ant species are members of the ant family , Formicidae , but there are several kinds that have evolved on their own the same behavior .