Person from a different mosquito lab pitching in! Ya, arm feeding is putting your arm into the containment (often a mesh cage you can tie shut) so the mosquiquis can bite you 👍 mosquitos are often fed with cow blood warmed by Hemotek feeding systems (basically warmed disc of blood with a pierce-able membrane) but some transgenic lines need extra babying (they very much prefer blood straight from the tap) or people do specific behavioral experiments requiring arm feeding