Lockdown also had positive effects. Thanks to the improvement of the Tagus waters as well as the reduction of noise pollution, dolphins have made a massive return to Lisbon Bay. Even if it is not an extremely rare event in itself, the frequency of the last visits (almost daily) as well as the number of dolphins goes out of the usual. Lisbob, the expatriate assistant in Portugal, tells you all about the return of these special visitors: dolphins in Lisbon.