Cats and spiders are "experts in geometry". In the cold winter, cats always hug their bodies into a ball when they sleep. There is also mathematics, because the sphere minimizes the surface area of the body, minimizes the surface area of the body exposed to cold air, and thus emits the least heat.

Spider's gossip web is very complicated and beautiful. This octagonal geometric pattern is difficult for carpenters to draw, just like drawing spider webs with rulers and compasses. When making a mathematical analysis of this beautiful structure, the concepts appearing on the spider web are really amazing-radius, chord, parallel line segment, triangle, congruent corresponding angle, logarithmic spiral, catenary and transcendental line.

When gecko preys on mosquitoes, flies, moths and other small insects, it always crawls along a spiral curve, which is called "spiral" in mathematics.

When a snake crawls, it follows a sine function diagram. Its spine is like a train, connected from section to section, and there is a lot of room for activity between sections. If the plane coordinates of each node are fixed and the starting point is taken as the coordinate origin, it will be found that the snake moves regularly according to the sine function curves of 30 degrees, 60 degrees and 90 degrees.