Answer:
Poison dart frog
There are no specific wild animals but you can give the one mentioned above. If its national animal we do have a perfect answer.
But not with a wild animal :)
Explanation:
Population is a dynamic thing and is affected by many internal and external factors. When we do population estimation, we mainly do it based on statistics. We note the past trends of population growth and try to predict the future size of the population at the same rate of growth. We can not take into account all the factors that affect the growth rates at different manner. When the population is growing, its characters are changing constantly and thus it follows different rates of growth at every moment. Final size of a population is the total summation of these different rates of growth acting upon different sizes of population.