In many cases, animal experimentation is not meant to be a drastic intervention, but an observation.
Many universities and research laboratories are conducting experiments, including experiments using animals. Harvard University biologists spend a lot of time watching mice. This is what they do, as they studied the behaviors of small rodents and how genetics affect their relationships.
The coronavirus epidemic has stuck in a lot of things, so research has stopped. This is because they could not properly care for the mice due to adherence to the quarantine rules, so they had to be forced to move to the afterlife. There may have been talk that whoever can get an owner can live on, but being a mouse, they are short-lived little rodents anyway, and not everyone hears them. It was hard to decide which one could live and which one should die.
Among the mice from different institutions, there were also specimens that were bred for some tests, i.e., their acquisition was also more complicated.
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(Source: homeikedvenc.co.hu | images: pixabay.com (Images are illustrations)