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L'ultima novità allo zoo di Zurigo è l'arrivo di una coppia di giovani avvoltoi, della taglia più piccola in Europa tra le quattro specie presenti. Il loro nome è "capovaccai", come ha annunciato oggi, mercoledì, l'istituzione cittadina. Si tratta di uccelli — non più presenti in Svizzera allo stato selvatico dal 19° secolo — che cacciano piccoli vertebrati e insetti, ma possono agire anche come predatori di nidi. I due "grigi", una volta grandi, potranno raggiungere dimensioni fino a 1,70 metri di lunghezza per 2,2 chili.
Si stima ci siano tra le 3'000 e le 4'700 coppie in Europa
Il piumaggio dell'adulto, come quello della femmina già ospite nella struttura, è bianco, ma gli esemplari che non in cattività tendono a virare verso il ruggine o il marrone, a causa del fango o del terreno ricco di minerali in cui vivono.
L'esemplare adulto, una femmina, già ospite della struttura
Il loro numero (si stimano 3'000-4'700 coppie in Europa) è diminuito e alcune popolazioni sono minacciate dalla
caccia (tra cui anche
dall'accumulo di piombo in seguito all'ingestione dei pallini nelle carcasse), dagli
avvelenamenti intenzionali, dall'accumulo di
pesticidi oltre che dalla
collisione con i cavi
elettrici.
ATS/px
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