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On a sunny autumn day (19.09.2021) i saw a huge green larva crossing the street facing a wineyard. The picture was taken near Bozen, South Tyrol (22 °C that day). It is at least 14 cm long and 2 cm thick. It is entirely green, besides black and yellow stripes at each "segment" and with black spots at the lower part of the body. Additionally there is an red/black anal spine.

I would have guessed it is some kind of Acherontia atropos, but i am not entirely sure. enter image description here

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    $\begingroup$ Is that a green horn catepillar? Don't know anything about them or if that is even what they are called but when I saw that photo that name came into my memory somehow. Google seems to correct that term to hornworm catepillar. 4 inches. Similar pattern too. $\endgroup$
    – DKNguyen
    Sep 20, 2021 at 13:17
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    $\begingroup$ Sure looks like tomato hornworm, Manduca quinquemaculata or similar tobacco hornworm M. sexta, but Manduca is an American genus. Agrius convolvuli is European and similar larva, but seems to have a stripe connecting the slashes of the segments. $\endgroup$
    – mgkrebbs
    Sep 20, 2021 at 22:43
  • $\begingroup$ After some additional research, i would agreelso conclude its one of the larval stages of Agrius convolvuli , which looks pretty similar. So i guess mgkrebbs was right. A friend of mine, working as an agricultural entomologist said, that especially the black stripes of the larva can change during the developement. $\endgroup$
    – CoDa
    Sep 24, 2021 at 8:26

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