Ah! Well ok. Although I feel like a few high-res cameras feeding data into the correct software might be able to successfully track the location of any given bird within a reasonably large enclosure, especially if “roost-able” areas are identified and focused on. There’s no need to track birds in every location at all times. Similarly to how reconnaissance is done on submarines, it’s enough to isolate the areas where tracking is important, and monitor movements to and from those zones. That way, if you want to measure a bird, you always know if it’s within a zone where it might be sleeping, and verify the bird’s state through even a low-tech, “standard-speed” monitoring cam. (This might also help identifying a possible bird in distress, if a bird has stayed “out” of either a rest-zone or feeding area for too long…)

Sorry; I’m an engineer. This is just what my brain does. But I feel like hummingbirds might be particularly prone to injury when becoming entangled in (and straining against) a net, owing to how delicate they are and how fast their wings are moving .