Didinium is a voracious hunter of live food, namely Paramecium. It is found quite commonly in freshwater habitats such as ponds and other still waters. It is in constant motion, swimming around in search of prey.
1938 S Jefferson Nickel. CoinTrackers.com has estimated the 1938 S Jefferson Nickel value at an average of $3, one in certified mint state (MS+) could be worth $50.(see details)...umismatic Value: $3 to $50.00. Value: As a rough estimate of this coins value you can assume this coin in average condition will be valued at somewhere around $3, while one in certified mint state (MS+) condition could bring as much as $50 at auction.
The Jefferson Nickel was first struck by the U.S. Mint in 1938 and was a replacement for the buffalo nickel. This nickel was used during wartime, from the years 1942-1945. During this time, the Jefferson Nickel was minted with silver in order to preserve nickel for the war effort.