Animals are multicellular organisms that make up the kingdom Animalia. Animals possess several characteristics that set them apart from other life forms, including their ability to move, grow and reproduce. Their bodies are composed of specialized cells that can detect stimuli in their environment, allowing them to respond quickly and efficiently. Most animals have evolved complex senses such as vision, hearing and smell which allow them to interact with their environment on a more intricate level than plants or other types of living things.
Animals can be divided into two main groups: invertebrates and vertebrates. Invertebrates include creatures such as insects, spiders, worms and molluscs; these organisms lack a backbone or spinal column but still possess the ability to move around independently by either crawling or flying. Vertebrates are animals with backbones – they include fish, amphibians (such as frogs), reptiles (turtles and snakes) birds (ducks) mammals (humans) etc., all of which have developed specialized systems for movement such as fins for swimming in water or wings for flying through the air.
All animals need food in order to survive; some use photosynthesis directly while others must hunt down other animals or scavenge dead matter in order to obtain nutrients necessary for survival. As well as providing energy sources food is also important biologically because it provides essential vitamins minerals salts fats oils proteins carbohydrates etc., without which many body processes would not occur correctly leading eventually to disease/illness/death if left unchecked over time .
The study of animal behavior has become an increasingly popular field within scientific research circles today due largely thanks advances made possible by modern technology – both digital photography recording equipment , sophisticated observation techniques used alongside traditional methods like dissections help scientists further understand why certain species act behave way they do . This knowledge when applied appropriately can then be used improve conservation efforts protect endangered species reduce human conflict with wild populations .
In conclusion it’s clear see why so much attention given studying animal behaviour – this fascinating subject continues captivate researchers worldwide inspire next generation biologists zoologists alike ..