The animals are intended for special experiments.
The astronauts should investigate how the worm muscles develop in weightlessness. Nasa hopes that this will provide new insights into the effects of long-term missions on the health of their crews.

The freighter, built by the American aerospace company Northrop Grumman, took off at the tip of a 43-meter-high “Antares” rocket, as video recordings from the US space agency Nasa showed.
The Cygnus is scheduled to dock with the ISS at the beginning of next week.

The garbage will later burn up together with the capsule when it re-enters the earth’s atmosphere.
Incidentally, it is not the first time that worms have lived on the ISS. In 2014, a mission delivered earthworms and goldfish to the human outpost.
The animals were observed for a Russian-Japanese experiment that also looked at muscle wasting and bone loss in weightlessness. In addition, the researchers should find out how closed ecosystems change in space. Spiders and fruit flies also lived on the ISS.
The mirror
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https://www.spiegel.de/wissenschaft/weltall/raumstation-iss-privater-raumfrachter-bringt-wuermer-ins-all-a-a03cc598-bf5e-4ae3-b36e-bf209c72c142
Space station ISS private space freighter brings worms space