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It depends on the animal. Some go to sleep around nine, some at midnight. Some even stay up past midnight.
because some animals change its color like a chameleon and other animals
Different animals undergo different changes as they grow it depends on the species. Some grow, some molt, and some change completely.
Some species change coulour as a way to protect themselves from predators.
Oysters
Some animals that use shift shaping or changing appearance to change their disguise ,you have the lizard ,some lizard change color to protect themselves from there preys.
some animals change the colour of their fur in order to camoflage with their backgrounds
Some animals have a special abillity, such as chameleons, called camoflauge. They can blend in with their surroundings to protect themselves. Some other animals can change colors when they are angry, etc.
Global warming may change local climate and natural balance in some parts of the earth. Some animals can not survive the change in their environment. Animals will not kill as a response to global warming. Animals kills for food or territorial reasons.
some for the change of season some for the evironment some for the better to breed their baby
The leaders change at midnight each day though sometimes some of the leaders will stay.
Metamorphosis