Journal of Data Processing Kalin Dimitrov, Hristo Hristov and Stanio Kolev 12 2 2022 https://doi.org/10.6025/jdp/2022/12/2/29-35 https://www.dline.info/jdp/fulltext/v12n2/jdpv12n2_1.pdf It is accepted that the infrared radiometry has potential in observing and organizing animal life behaviour. While doing such kind of studies a few issues normally rise. We have studied such issues in this work. Also, we took sample data for measuring the solid angles with many animal kinds.