In another day this cactus bloom will open up all the way and the bees will go so deep inside you can’t even see them. It is never wise to get your nose too close to a cactus in bloom. If the thorns don’t get you a bee up your nose surely will.
These grow to about 6 inches tall usually, some as high as a foot. But that is rare. Often buried back under brush where they have cover and rain water collects. More likely it is because that is where the bird deposited them.