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You seem to be conflating evolution with learning. Seagulls didn't evolve to steal from trashcans, they learned to. As for the main point of your question: the
by sznio 2y ago
You seem to be conflating evolution with learning. Seagulls didn't evolve to steal from trashcans, they learned to.
As for the main point of your question: the clams are replaced every so often, so they won't end up getting used to the city water and stop serving as a marker.
- n0rdy 2y agoGot it, learning is something that can be acquired relatively quickly, while evolving needs generations. Thanks for the explanation.
- grvbck 2y agoValid question though, and the answer to what I think you wanted to know is >3 months: > the clams are “paid back after three months of work by releasing them to a place from which they will never be caught again”. [---] this is done because they eventually become resistant to contamination in the water. https://www.zmescience.com/ecology/poznan-mussel-water-plants-892524/ https://www.zmescience.com/ecology/poznan-mussel-water-plant...