(Do you know these animals? ใส่รูปใน power point) Many animals like the Schomburgk's deer สมัน, Tapir สมเสร็จ and Hornbill นกเงือก used to be plentiful. But now two of these are much endangered and the Schomburgk's deer is extinct. This can only be explained by human actions-technology development. Technology development cause waste, pollution (air,water,soil) and poor human health.