The main problems of wildlife resources cause of extinction or decrease of wildlife are as follows.1. Destroy the housing expansion of crop area. The living space to the living of human beings. Destroyed the housing and living. Wildlife to realizing.2. Natural reduction or extinction of wildlife, because natural adaptation of wildlife to adapt to living in an environment that changes constantly. Wildlife species adapt will survive if couldn't adjust to die. The decline and extinction finally.3. The hunt directly. If it is hunted by the animals themselves. Wild animals will not decrease or extinct very quickly, such as tiger, leopard, wild dogs, dogs and จอกล่า deer and barking deer. The animals hunted two kinds. May died down, but will not disappear completely. Because of the nature and will be born. The balance is always between the hunter and the hunted, but if be hunted by humans as food to hunt for sport or for occupation. Wild animals will be greatly reduced.4. Due to toxic substances. When farmers use chemicals, such as pesticides, crop will make any toxins in the environment. In addition to public health sometimes need to get rid of rats and insects as well. The chemicals used in various activities, these have many kinds of toxic residues, which will get the toxic according to animal food chain. The toxins to accumulate in the wild. If the toxin has enough in number would die down or affect children, such as the body is not perfect, ไม่สมประกอบ effective birth, grandson great-grandson next is limited. Eventually will be decreased, and the extinct.5. The animals from other dialect. This example also appeared not pronounced in Thailand. But in some countries will find this problem, such as the mongoose to get rid of me. Later, when I have the mongoose ruined crops planted instead, etc. the problem wildlife formed at present. Will result in the wildlife extinction in the future if not correct lit or distinguish until ไม่คำนึงถึงสภาพ reality condition.
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