Ants Transporting Object, One
As best I can discern, what they're transporting is faeces.
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License & Attribution
By Joaquim Baeta. The files associated with this video are licensed under a Creative Commons Attribution 4.0 International license. You are free to distribute, remix, adapt, and build upon them in any medium or format, even for commercial purposes, provided you give appropriate credit to Joaquim Baeta.
Example attribution: "Ants Transporting Object, One" by Joaquim Baeta, https://scenoptica.com/footage/ants-transporting-object-one.html, CC BY.