All organisms provide themselves with food and water, often they manage to avoid being eaten by other organisms, they reproduce themselves (they follow courtship and mating rituals) and finally they take care of their offspring. All these activities are very important for animals’ survival and for species success. Behaviour characteristics are subject to evolution: normally the behaviour varies among single individuals, and behaviours are more advantageous than others. Some variations are determined by genes, and the most successful ones will be predominant.
Spider predation
European frog and eggs
Aquila catches a fish
Spider with brood on the abdomen
Koala with cub
Metamorphosis of the monarch butterfly
Lynx with cub
Brood of swallows
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