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

Question:

Answer:

BOVINE

Length:

Similar Crossword Questions:

Make of six models that are subject to recall ... and being sent back inside this puzzle's theme entries
Nickname for the three-letter abbreviation hidden in this puzzle's theme entries
Many people get one in the summer (and so do this puzzle's theme entries)
It can follow the last word of this puzzle's theme entries
What this puzzle's theme entries take, vowel-wise
Levels that are split in this puzzle's theme entries
Quadrennial occasion celebrated by this puzzle's theme entries
Office building problem that's a hint to this puzzle's theme entries (see their last three letters)
What this puzzle's theme entries have
"Infections" inside this puzzle's theme entries
What this puzzle's theme entries are
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"Lid" in each of this puzzle's theme entries
What each of this puzzle's theme entries contains
They're hidden in this puzzle's theme entries
Second of a pair of letters swapped six times in this puzzle's theme entries
What this puzzle's theme entries probably do?
Like the four theme entries in this puzzle, as it were
What are featured in the theme entries of this puzzle
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
What the three theme entries in this puzzle are, in either of two ways
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Back to the beginning (like how this puzzle's theme goes)
Challenged, or what the theme entries in this puzzle should be