Question

The population of rabbits in a forest is decreasing. Foxes in that region are now competing with each other for the limited number of rabbits in that forest. Which type of competition exists among these foxes?

Answer 1

Rabbits are eaten by predators such as foxes and wild dogs. If rabbit number decline predators ( foxes ) compete for the rest of the resources in forest. This is the competition between the members of same species or : interspecific competition. Foxes compete for the same resource ( rabbits ).
Answer: Interspecific competition.  

Answer 2

The other answer is almost right; however, interspecific is when animals of contrasting species fight for a food source.

Intraspecific is when animals of the same species fight for a food source. Since the foxes are fighting each other, intraspecific is your answer.