There's one at the beginning of each of this puzzle's four theme entries

Question:

Answer:

BOVINE

Length:

Similar Crossword Questions:

"Lid" in each of this puzzle's theme entries
They're hidden in this puzzle's theme entries
Many people get one in the summer (and so do this puzzle's theme entries)
Quadrennial occasion celebrated by this puzzle's theme entries
What this puzzle's theme entries have
What are featured in the theme entries of this puzzle
This puzzle's theme entries, e.g.
What each of this puzzle's theme entries contains
What this puzzle's theme entries take, vowel-wise
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Levels that are split in this puzzle's theme entries
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Like fish for fish & chips -- or this puzzle's four theme entries
Just making things up, or a synonym for a three-word phrase describing this puzzle's theme entries
Back to the beginning (like how this puzzle's theme goes)
Second of a pair of letters swapped six times in this puzzle's theme entries
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First of a pair of letters swapped six times in this puzzle's theme entries
Like the four theme entries in this puzzle, as it were
What this puzzle's theme entries are
What the names in this puzzle's theme entries begin with
What the constructor had to do to create the theme entries in this puzzle (boyeee)
What the three theme entries in this puzzle are, in either of two ways