Vanishing French wildlife

We have been living here for 15 years. In that time, I have covered considerable ground in the daily dog walk. 

Over the years, I have noticed a steady reduction in numbers in all of wild animals.

This is an agricultural part of France, fields are rarely left fallow, and sprayed at least three times a year.

As a result, it seems the lower end of the food chain has suffered badly.

If the bug/insect population drops, it follows that small mammals will have less to eat, with a knock-on effect for larger mammals and the raptors.

Is it possible that the ‘agri-businesses’ have not noticed the environmental changes, or do they not care?

MJ STREET, Deux-Sèvres