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Thread: Run, Hop.....

  1. #1 Run, Hop..... 
    Time Lord zinjanthropos's Avatar
    Join Date
    Dec 2005
    Driving in my car
    ......or both? Many know that I have a few bird feeders on my property. Gives me a chance to observe their behaviour and I’ve learned some things just by watching. There is a bird that uses my property to feed from but it doesn’t use the feeders nor is it a raptor. Plain old American Robin shows up in the Spring and back into the woods by beginning of winter.

    Watched one forage the other day and saw something I hadn’t noticed before. When the robin was in the mowed grass it hopped from place to place and when it was on a hard surface like asphalt, wood or concrete the bird would put one foot in front of the other, walking or running. Now I haven’t really looked around at many robins to compare so I can’t say all robins do this. My thoughts were that the bird found less resistance to its movement in the grass by hopping, or caused less vibration that might warn potential prey or it’s crucial when avoiding predators, and I’m not even sure if any of that’s true.

    Naturally that got me thinking of avian lineage and their dinosaur ancestors. Surprisingly I found many articles where scientists theorize some dinos, including T-Rex, may have hopped. Would a giant predator lizard have more success landing on its victim or trying to put jaws on it? Cats for example, usually trip up bigger prey before going for the jugular. Can’t see T-Rex doing that with its little arms but one well timed leap would do the trick.

    Does leaping forward provide extra speed? If T-Rex had long forelegs would they be more of a hindrance running or hopping? Thinking of a kangaroo there with its small forelegs. I’ve heard the theory is a kangaroo’s forelegs are short to avoid contacting the joey but that may be only part of reason, idk.

    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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