Explanation: Some of the important reasons of the declining of wildlife are as follows:

• Industrial and technological advancement brought about a rapid increase in the exploitation of forest resources.
• More and more lands were cleared for agriculture, human settlement, roads, mining, reservoirs, etc.
• Pressure on forests mounted due to lopping for fodder and fuel wood and removal of small timber by the local people.
• Grazing by domestic cattle caused an adverse effect on wildlife and its habitat.
• Hunting was taken up as a sport by the elite and hundreds of wild animals were killed in a single hunt. Now commercial poaching is rampant.
• Incidence of forest fire.

Source: NCERT