There are many organisms that one can extract milky substances from, but cactus is NOT one of those. Which is a simple and useful way to figure out if the needly thing in front of you is a cactus or something else....
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As promised, I'll be posting some pictures of flies we caught in and around Tucson, Arizona. But before we can talk about the flies, we need to talk about the local flora.
I got a kick out of that post as well. It's always good to be reminded of examples of convergent evolution!