Hymenopteran moving slowly over ivy

Hymenopteran moving slowly over ivy

Observation - Hymenopteran moving slowly over ivy - UK and Ireland. Description: I am wondering if one can discriminate between a parasitic wasp which is simply feeding (moving slowly) and one which is searching for a host (moving quickly and in leaps)

I am wondering if one can discriminate between a parasitic wasp which is simply feeding (moving slowly) and one which is searching for a host (moving quickly and in leaps)