His sense of smell. It is one of the main reasons why Gandalf chooses Bilbo as the 14th member of the Company (because while Smaug would be familiar with the smell of Dwarf, the smell of Hobbit "would be all but unknown to him").
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A keen person is a person with sharp senses; quick to understand.
No, the third movie concluded the Hobbit movie series. The events at the very end of the Hobbit, lead on to the events of the beginning of the Lord of the Rings trilogy.
That would be Bilbo at his birthday feast in Laketown. He had caught a cold in the river riding the barrels.
Camping, lack of comfort and the greatly reduced number of meals.
Trolls are evil imitations of the Ents brought into being during the Song of the Ainur at the beginning when Melchor corrupted the words and melody of a part of the song.Trolls are very stupid, large creatures, that are always hungry, but turn into stone when exposed to the light of the sun.