Yussef introduces us to some incredible - if not misunderstood - arachnids and their fascinating features. For example, spiders have glands in their bottoms called spinnerets, which spin silk for them to create masterfully engineered webs
3 hearts and blue blood? Nope, it's not an alien - meet the octopus. Octopuses have developed incredible adaptations to life underwater, like squirting ink and colour changing skin
From their adorable waddles to their incredible speed in the water, penguins are some truly incredible birds. They have specially shaped flippers which help them glide swiftly through the water
Crabs are around 450million years old, and feed mostly on the dead sea plants and animals that gather on the sea floor. Some crabs lay 100,000 eggs in one go, though not that many will make it to adulthood.
The biggest animal to have ever lived is still alive today - and its tongue weighs more than a fully grown elephant. We delve into the life of the blue whale and other amazing whale facts.
This ferocious feline is the world's largest big cat - the tiger. Unlike most cat species, tigers love water and are great swimmers. They can swim up to 6 kilometers.