Cardinal Eyes

there is a family of cardinals in my backyard with a unique birdcall, compared to the usual chitter chatter among the wildlife in the city here. sparrows are common, starlings, sometimes robins, woodpeckers, but my favourite so far are the cardinals, who visit only for a few minutes and then, red feathers flashing, flit back through the trees to where they came from. they come and leave so fast i can never get a good photo of them!