| You phrased this question slightly differently here and I now see that you just need an answer to a question, not that you are going to set up an experiment. Not sure why I thought that before.
Practically any two species will interact somewhat if they live in the same environment, although sometimes it might seem pretty indirect. Competing is one form of interaction, not an alternative. Another is predation, one animal eating another--like robins eating earthworms in my other post, a cat eating a mouse, or a bird eating a seed. Or animals may browse--like cows eating grass or deer eating your rose bushes. Other interactions include parasites, either internal ones like pin worms or tape worms, or external ones like fleas, ticks, mosquitos, or lice. I could go on, but you get the idea.
Hope this helps. |