Based on the clue in parentheses, find a four-letter word that can be inserted backwards into the blank to complete a longer word.
Example: di____ve (a defeat)
Answer: dissolve ("A defeat" gives you LOSS, which is placed backwards in the blank: di_SSOL_ve.)
1. mu____ds (rodents)
2. fro____g (young lice)
3. con____s (flightless birds)
4. ta____le (flying mammals)