Showing posts with label aggressive. Show all posts
Showing posts with label aggressive. Show all posts

Climate Change Could Make Timid Animals More Aggressive

Climate change can cause changes in behavior. As water becomes warmer so some species of fish become aggressive. Some fish are inherently timid while others are bold. In experiments on fish from the Australian Barrier reef, when water was slowly warmed normally timid fish became aggressive. Their rate of activity increased as well. Evolution has created fish that fit into a niche where survival depends on a fish being very careful about its surroundings. If they openly attack larger fish it could mean the smaller ones will be eaten.

It is possible that similar changes will occur with reptiles, amphibians, ectotherms and even mammals. If timid animals become bold then they could be killed off by predators or by humans using harvesting equipment trying to catch other animals for food. Only a very small increase in temperature led to the change.

In the tests, fish were bred in captivity then released into holding tanks where the water was slowly warmed. They had no chance to socialize with wild fish. When the water was cool the fish hid in plastic pipe. As the water heated up the fish ventured further from the protective pipe.

Certain assumptions can be made from this research. As the Arctic ice disappears, Polar bears wandering near small towns in Alaska, Canada and Northern Europe could become more brazen in their search for food from garbage cans and dump sites. They could kill humans more frequently in their anger. Similarly, rats living in these cold climes may not just die of shock when hit. They could turn on people and fight back.
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Bully Gorilla

"Just playing with my yo yo."
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Funny Animal Photos
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The Dung Beetle Is the Strongest of Them All

Who's the strongest pound for pound? That bug upon the ground!

Scientists have worked out which creature is the strongest. It is a dung beetle, Onthophagus taurus. This tiny bug can pull 1,141 times its own body weight. For a human to equal this he/she would have to lift 80 tonnes, equivalent to six trucks.

The dung beetle has to be extremely fit and healthy to accomplish this feat. Putting them on poor diets before a test reduced the amount they could pull. Apparently, they have to be strong because of their lifestyle. A male digs a deep hole under a dung pat where he mates with a female. If another male enters the tunnel the two males will fight a furious battle by locking horns until one is pushed out. The more weight a male can pull the more likely he is to win the fight and be able to mate, thus passing on his genes for high strength.

Some male beetle don't seem to compete with the large aggressive males. They are born smaller and weaker. When they were fed more they still did not take up the fight, but their testicles became larger. This enables them to mate more often taking advantage of larger males who let their guard down.
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