Puzzle 13
Hidden in the grid below are six hidden animals.
The letters are in sequence, but you move from letter to letter using the moves of a chess knight.
Once you have crossed off all of the animals, you will be left with seven unused letters.
What animal do these letters spell?

The moves of a knight are:

Note: this puzzle is not interactive, and the letters cannot be clicked.
Puzzle 14
Three people check into a hotel.
They pay £30 to the manager and go to their room.
The manager suddenly remembers that the room rate is £25 and gives £5 to the porter to return to the people.
On the way to the room the porter reasons that £5 would be difficult to share among three people so they keep £2 and give £1 to each person.
Now each person paid £10 and got back £1.
So they paid £9 each, totalling £27. The porter has £2, totalling £29.
Where is the missing £1?
Puzzle 15
How many cubic feet of earth are removed …
… to make a hole 4 feet wide by 7 feet long by 2 feet deep?