A Shrimps heart is located on its head.
Mixed heart means the heart in which the oxygenated and the deoxygenated blood is mixed. Reptiles and amphibians have mixed heart.
The shortest gestation period known is 12 to 13 days, shared by three marsupials: the American or Virginian opossum (Didelphis marsupialis); the rare water opossum, or yapok (Chironectes minimus) of central and northern South America; and the eastern native cat (Dasyurus viverrinus) of Australia.
Gestation is the period of time between fertilization and birth in oviparous animals.
The elephant has the longest gestation period of about 23 months of any land animal.
Although well known as one of the most iconic dinosaurs, Brontosaurus (the 'thunder lizard') has long been considered misclassified. Since 1903, the scientific community has believed that the genus Brontosaurus was in fact the Apatosaurus.
A Group of birds or a flock flying together in hundreds or even in thousands is called Murmuration.
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