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Carbon Cycle and a Dead Cat

24 Sep

carbon cycle 1It was time to learn the carbon cycle in bio class. Two smarty-pants in the back of the class, copied the notes and decided they could now play games. Why not, they got the material. They have good grades. Fortunately I saw this opportunity as a break from my teaching. I handed them the chalk and my notes and said, “Teach.” They taught about carbon moving from the air, to the trees and plants through photosynthesis, then to the animals that ate the plants, and was eventually breathed out the carbon in the form of carbon dioxide.

“Keep going.” I prodded,
“Do we have to draw the dead rabbit?”
“What do you think?”
“Well we have a picture of a dead dog on our phone we found on our way home from school. Can we use that?”
“Heck yeah.”
dead cat bonesThey showed the picture around and explained that the carbon stored in living things is released after death during the process of decomposition.

 

 

cat giordonBut there is more to the story. The next day Giordon walks in all geared up carrying a plastic bag. Guess what was in the bag. If you think it was a dead dog, you would be wrong. We examined the carcass through the double plastic bags. It had passed through putrification and was pretty well dessicated. So it smelled sweet as opposed to rancid. We determined by the teeth and claws it was a cat.

 

Not to be out done by my students, in the area of “grossness’. I brought the carcass home and soaked it in a bucket of water. The fur was stuck hard to the skull so it took all summer for it to finally separate. I fished the bones out with a pair of needle-nosed pliers. Not a bad collection of bones. Some of the spine and ribs are still stuck in the guts, but the skull, leg bones and half the spine can be seen here. Remember some of the body tissue has been released as carbon gas back into the carbon cycle. That is what it is all about.cat bones

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Posted by on September 24, 2014 in Children's Art & Science Classes, Science, science in the parks, Uncategorized

 

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