This is the 2379th most frequent Japanese word.
シカ
"シカ" (shika) means "deer" in English.
In this sentence, 'シカ' refers to the animal 'deer.'
シカは森に住んでいます。
Deer live in the forest.
Here, 'シカ' is again used to mean 'deer,' emphasizing that the speaker observed one.
昨日、シカを見ました。
Yesterday, I saw a deer.
In this sentence, 'シカたがない' is an idiomatic expression meaning 'there's no help for it' or 'it can't be helped,' unrelated to the animal 'deer.'