How did the ants finally succeed in getting across the water-filled ditch?

Explanation:

Cooperation is the key to success for ants in crossing obstacles like water-filled ditches. The ants succeeded in getting across the water-filled ditch by cooperating and working together. This can be deduced from the provided texts, specifically the one describing ants moving a much larger insect prey as a group. Cooperation is a hallmark behavior in ant colonies enabling them to accomplish tasks that would be impossible individually. The descriptions provided resemble the natural behavior of ants which involves complex social organization and collective problem-solving abilities, often leading to efficient navigation and resource management, as shown in the video by Science Friday.