Answer: The fox had its right foreleg capuchin securely in the trap´s jaws
Step-by-step explanation:
The mistake is the absence of the possessive apostrophe that sets the jaws as part of the trap´s mechanism. A possessive apostrophe is mostly used by adding 's to a noun, such as the word "trap" in this example.
The apostrophe can be used for possession and contractions, and is possible to mistake "its" and "it's", but, in this case, "its right foreleg" is not a mistake.