Another movie with ants. Help please

Hello
I remember in 1996 when I seen this ants animation which now I cannot remember the title. It must also been in german or italian as many animation I had were. Please help me out find the title of this animation.
Summary:
The ants where blue or green, there was about a teenager ant and something with his grandpa. For this teenager ant to enter in a bar they had to have an extra bump in his rear to be considered adults, so he and his girlfriend or friend stick half a fruit or some sort to build the bump, but they got caught.
I also remember something about a egg facility where he lost an egg and went to search for it in the tunnels. It meet a earthworm and the 2 heads were quite ugly, and they wanted to eat the egg or him, but managed to escape. Also something about the sun shining in the egg and modifiing him or some sort.
The animation was pretty old, '90's year.
Anyone familiar? Again it was an animation

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