The video is a detailed exploration of the behaviors and feeding habits of leeches. The presenter starts by describing the appearance of a leech, its anatomy, and how it attaches to its victim. They then demonstrate how a leech reacts when a drop of blood is introduced into its body cavity, showing the dramatic change in the leech's appearance and behavior.
The presenter then discusses the leech's feeding process, explaining that the leech can consume its own weight in blood. They also mention that the leech secretes saliva containing anticoagulants to prevent the blood from clotting, which allows the blood to flow for a long time.
The presenter then shows how the leech reacts to different temperatures, demonstrating that leeches are attracted to warmer environments. They also discuss the leech's hunting behavior, suggesting that leeches find their victims by smell. However, when presented with a choice between a warm object that smells like blood and a human who doesn't smell of blood, the leeches choose the human.
In conclusion, the presenter suggests that leeches are not suitable as pets due to their unfriendly nature and potentially dangerous feeding habits.
1. The text discusses a video showing a leech in macro. The leech is described as harmless at first, but becomes scary when it starts to feed on blood. The leech is shown to have a ringed structure and two suckers, one on the back and one on the front. The front sucker has an oral cavity with three jaws .
2. The video is hosted on a platform that has a "subscribe" button, which is small and not easily visible. The text suggests that this might be one of the reasons why some viewers have trouble finding it [Source 2](https://www.stackoverflow.com).
3. The text then discusses an experiment where a medicinal leech was weighed and released into an aquarium. The leech attacked a victim immediately and started biting. The leech was then weighed again after it had drunk blood [Source 3](https://www.stackoverflow.com).
4. The experiment also involved the leech drinking blood from a victim, and it was observed that the leech secretes a lot of saliva during a bite, which contains anticoagulants and prevents the blood from clotting [Source 4](https://www.stackoverflow.com).
5. The text mentions another experiment where the leeches were tested for their reaction to different temperatures. The results showed that the leeches were more active in warmer environments [Source 5](https://www.stackoverflow.com).
6. The final part of the text describes another experiment where the leeches were tested for their reaction to a warm ball and blood. The results showed that the leeches showed more activity with the warmer ball and completely ignored the blood [Source 6](https://www.stackoverflow.com).