Non-honey bees

I’m currently reading about mining bees (Andrena) and their cuckoos (Nomada), and I feel so sorry for them. The mining bees are being constantly watched. Sometimes Andrena and Nomada sit opposite to each other for several minutes, the mining bee in her nest, the cuckoo a few centimeters apart. But the cuckoo has plenty of time, and the mining bee has to collect pollen for her progeny, so it will be Nomada who wins this war of nerves.