recently, i read about something like a.belladonna and hyoscyamus niger which are both lethal posion. Their effects are amazing, just a few berries and root can kill people, however it is said that some animal is not affected by the poision. By the way, A.belladonna have a poison call alkaloids. why is it that animal is not affected??? any answer to this. Hope u all enjoy discussing toxic.... 
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It is because every type of animal has different anatomies and they have different immunities. It is like birds who eat berries which would be poisonous to humans. Another example is cockroaches, which can live with much mroe radiation than humans (during Hiroshima they were still living and thriving while the humans in the area were dying).
I would think that those immune animals were the animals that lived in areas with a lot of the poisonous plants. The ones that could live, or had a better chance of living once they ingested the poison would go on to reproduce more so than the animals that didn't have such a great chance of living. On the other hand, though, maybe the most poisonous plants would live, and the less poisonous plants wouldn't, eventually strengthening the poison. I don't know.
I do know this, however. Bees don't have many taste receptors because taste generally exists to tell us if something is good or bad for us. If any kind of plant was bad for a bee, it wouldn't last very long (because bees are the driving force behind pollination), so the bees really didn't have much to worry about. Just something to think about.
Yea drawingguy also brings up a good point about survival of the fittest. It is the idea that the most dominant organisms will live the longest in because they have what it takes to best survive in their environment. It is the whole thing with Darwinian science (if you can call it that), you should research it if you are interested in things like survival of the fittest; just google Charles Darwin.
My sixth-grade English teacher told the class that the great white shark was immune to cancer. I thought that was amazing, so I looked it up. Turns out, it's not immune, it's just postulated to be immune because it doesn't get enough exposure to sunlight, industrial chemicals, or pure radiation to develop any of the DNA errors that lead to cancerous cells. (Also, I doubt there has ever been a completely comprehensive study of the great white population in respect to cancer.)
Sadly, this may change if we keep shoveling crap into our oceans. Dolphins with metasticular cancer have washed ashore in Florida already.
Nothing is immune to humans. Just my two cents.
My sixth-grade English teacher told the class that the great white shark was immune to cancer. I thought that was amazing, so I looked it up. Turns out, it's not immune, it's just postulated to be immune because it doesn't get enough exposure to sunlight, industrial chemicals, or pure radiation to develop any of the DNA errors that lead to cancerous cells. (Also, I doubt there has ever been a completely comprehensive study of the great white population in respect to cancer.)
Sadly, this may change if we keep shoveling crap into our oceans. Dolphins with metasticular cancer have washed ashore in Florida already.
Nothing is immune to humans. Just my two cents.
