Afrikkalaiset etanat ovat maan suurimmat nilviäiset. Alun perin heidän elinympäristönsä oli Itä-Afrikka;
Enimmäiskoko, johon etana voi kasvaa, on 30 senttimetriä kuoren pituudella; painon mukaan se jopa pääsi Guinnessin ennätystietokirjaan vuonna 1976, painolla 2 kg;
Koruhermosto koostuu 20 tuhannesta neuronista, ja ihmisen aivot, ve
rtailun vuoksi, sisältävät useita satoja miljardia neuronia.
Äskettäin etanat alkavat aktiivisesti käyttää hermokudosten luovuttajina aivosairauksien hoidossa. Rotilla on jo olemassa tuloksia ensimmäisistä onnistuneista kokeista, jotka koskevat etanoiden hermosolmujen siirtämistä;

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Etana sarvet ovat kuin nenä. Kaikki etanoissa olevat hajureseptorit laajennetaan ns. Sarviin;
Tutkimusten mukaan etanat eivät näe. Ne erottavat vain valon ja pimeyden;
Etanoissa on noin 25 tuhat hammasta, jotka on järjestetty raastina. He eivät kuitenkaan pureskele ruokaa, vaan jauhavat sen;
Rypäleen etana voi saavuttaa maksiminopeuden jopa 7 cm / min;
Euroopassa etanat syödään herkullisena. Etana liha sisältää enemmän proteiinia kuin kananmunat;
Afrikassa etanat näkevät maukasta lihaa, Yhdysvalloissa - kansallinen katastrofi, Euroopassa herkkyys- ja ikääntymistä estävä aine kasvojen iholle, Ukrainassa - ihanteellisia lemmikkejä;
Etanat ovat kuuroja olentoja. Heillä ei ole edes kuuloelimiä, eivätkä he itse "puhu". Heidän elämässään kaikki perustuu kosketukseen;
Etanat voivat kuljettaa lastia kuoressaan, joka on jopa 10-kertainen etanan painosta;
Etana suorassa merkityksessä voi ”kävellä veitsen terää pitkin” eikä sattua. Tämä johtuu siitä, että se erittää erityistä limaa, joka suojaa sitä vaurioilta;
Etanan runko on epäsymmetrinen. Se koostuu jalkapohjasta, tavaratilasta ja päästä. Jalka ja pää vedetään kuoreen vahvan lihaksen avulla, joka peittää simpukan rungon;
Etanaurheilu - kyllä, sellaista todella on olemassa. He ovat tyytyväisiä Englannissa. Etanat indeksoivat ”juoksumattoaan” pitkin salaatinlehteiden polkua. "Voittaja" -palkinto on sama salaattilehti;
Etanoiden havaitseminen rauhoittaa hermostoa hyvin.


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