Spikey maggot like larva

Spikey maggot like larva

Observation - Spikey maggot like larva. Description: Noticed some sort of larva/maggot on car window after returning from a walk. The car was parked under a ssycamore tree. The larva was about 5mm in length and when tempted onto a bit of leaf its tapered end (top of photo) reared up. I would be really in

Noticed some sort of larva/maggot on car window after returning from a walk. The car was parked under a ssycamore tree. The larva was about 5mm in length and when tempted onto a bit of leaf its tapered end (top of photo) reared up. I would be really interested in knowing what this little fellow is or will become.