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Gli sforzi di protezione della natura portano effettivamente a un aumento di esemplari di specie minacciate o estinte ma il loro spazio vitale diventa sempre più esiguo. Lo dice uno studio della "London Zoological Society".
In Svizzera vi sono 1'600 castori, 300 linci, 198 cicogne e 9 gipeti barbuti, tutti animali che erano scomparsi dalla Confederazione tra 50 e 100 anni fa.
Tuttavia questo quadro è solo apparentemente idilliaco: queste specie ed anche altre vivono in un ambiente precario, hanno bisogno di interventi per sopravvivere; le restrizioni alla caccia non bastano.
ats/mas
Gallery image - Specie minacciate, va mantenuta allerta
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