New answers tagged period
It is always correct to split two full sentences with a period (full stop). But, you may use a semi-colon or colon to join separate sentences. But, where to use each is largely determined by the intention of joining those sentences. If the sentences are merely related, then a semi-colon is a good choice. Mary ate dinner; she had roasted chicken. ...
All of them are correct, but "Why" in the second shouldn't be capitalized.
Your current version is fine without any changes, although technically you shouldn't start a sentence with a conjunction so the last sentence you would drop the 'and' (also 'discussed' has two 's's): Many cases of animal suicide were discussed. A duck drowned itself after the death of its companion. A school of dolphins stranded on a beach with no ...
If you consider the cases as a list you can write: Many cases of animal suicide were discussed: a duck drowned itself after the death of its companion, a school of dolphins stranded on a beach with no reason whatsoever, A deer threw itself from a cliff to avoid being eaten by hunting dogs. And the list went on and on.
I wouldn't use commas, since each incident listed is in a complete sentence. But you want to group them together to show that it is a list, so semi-colons is the best solution. There were many cases of animal suicide in the paper. A duck drowned itself after the death of its companion; a school of dolphins [was] stranded on a beach with no reason ...
Write what sounds natural. I like changing the verbs and joining with commas: There were many cases of animal suicide in the paper: a duck drowning itself after the death of its companion, a school of dolphins beaching itself for no apparent reason, a deer throwing itself from a cliff to avoid being eaten by hunting dogs. The list went on and on.
If the final clause is to be introduced with an 'and', then they should be separated by commas. Whether you place a comma directly before the 'and' (a usage called the 'serial comma') is sometimes a matter of style, but in this case I would argue that it is necessary (from intuition, I'm not aware of the terminologies and conventions governing this ...
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