A fly with yellow markings is eating a fly with pale markings. They're on my hand

A fly with yellow markings is eating a fly with pale markings. They're on a shirt

🪰 Can an #entomologist help me identify these #flies
I think one is eating the other
This was taken at Tongariro National Park in New Zealand
#Flyday #bugs #bugsky #entomology #whatisthisbug #insects #insectidentification #identifythisinsect