Jurassic Period – dinosaurs and ferns
A dinosaur skeleton from the Jurassic period How the Jurassic period began When the Jurassic period began, about 199 million years ago, a lot of animals had just become extinct [...]
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06, 2017
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06, 2017
What happened in the Cretaceous Period?
Volcano erupting When was the Cretaceous period? During the Cretaceous period, beginning about 145 million years ago, the continents continued to drift away from each other. Plate tectonics Back to [...]
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06, 2017
History of turkeys – Where do turkeys come from?
History of turkeys: Wild turkeys When did turkeys evolve? Turkeys evolved from earlier birds. The ancestors of the turkey evolved about 100 million years ago, from the dinosaurs that were [...]
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05, 2017
Eggs – Evolution and Biology
Fish eggs: Egg evolution starts with soft eggs like these When did the first eggs evolve? The earliest living creatures made babies by dividing themselves in half, so that one [...]
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05, 2017
How do animals breathe? Respiration, Evolution, Biology
Fish gills The first cells, which evolved about 3.8 billion years ago, needed carbon dioxide to live and not oxygen. They needed the carbon dioxide to help them break down [...]
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05, 2017
Mollusks and cephalopods – Biology
Evolution of mollusks: Slugs are a kind of mollusk. When did the first mollusks appear? Mollusks are animals like mussels, clams, snails and slugs. Their name means "soft", because mollusks don't have [...]
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05, 2017
What are reptiles? Biology and Evolution
Boa Constrictor snake Some kinds of amphibians evolved into reptiles about 300 million years ago. At this time, plate tectonics had moved more and more of the land on Earth into [...]
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05, 2017
What are Chordates? (Animals with spinal cords)
Chordates include this giraffe from Kenya What is a chordate? Any animal that has a spinal cord is a chordate. This group covers most of the creatures you see at [...]
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05, 2017
History of Birds – Biology
A robin sits on a branch: birds biology When did birds evolve? The first birds evolved out of earlier small dinosaurs late in the Jurassic period, about 150 million years [...]
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05, 2017
Bird Feathers – a bird project – Biology
Bird feathers have many tiny barbs Observing bird feathers You can see how bird feathers work for yourself. First, go to a park or a place where there are pigeons [...]
