Animals
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![X and Y chromosomes in cell x and y chromosomes in cell](https://hips.hearstapps.com/hmg-prod/images/and-y-chromosomes-in-cell-royalty-free-image-1718741582.jpg?crop=0.338xw:0.587xh;0.658xw,0.212xh&resize=360:*)
Y Chromosome Is Evolving Rapidly Among Great Apes
![Pikaia gracilens catalog number usnm pal 57628, a fossilized pikaia gracilens specimen in a slab of burgess shale from the paleobiology collections at the smithsonian institution national museum of natural history in washington, dc](https://hips.hearstapps.com/hmg-prod/images/chordate-666c8223f03fe.jpg?crop=0.524xw:1.00xh;0.239xw,0&resize=360:*)
Study Offers Upside-Down Look on 'First Chordate'
![Trail of bright light in box trail of bright light in box](https://hips.hearstapps.com/hmg-prod/images/trail-of-bright-light-in-box-royalty-free-image-1718302361.jpg?crop=0.732xw:1.00xh;0.135xw,0&resize=360:*)
The Third Form of Life's Energy-Making Secret
![Monkey + sunset monkey sunset](https://hips.hearstapps.com/hmg-prod/images/monkey-sunset-royalty-free-image-1718299405.jpg?crop=0.655xw:1.00xh;0.106xw,0&resize=360:*)
This Hominid Could be the Smallest Great Ape Ever
![A branching orange and purple Tree Coral perched on a shelf on a reef. a branching orange and purple tree coral perched on a shelf on a reef](https://hips.hearstapps.com/hmg-prod/images/branching-orange-and-purple-tree-coral-perched-on-a-royalty-free-image-1714136961.jpg?crop=0.668xw:1.00xh;0.167xw,0&resize=360:*)
Scientists Are Building a Noah’s Ark for Corals
![Cell cell](https://hips.hearstapps.com/hmg-prod/images/cell-royalty-free-image-1713988155.jpg?crop=0.66682xw:1xh;center,top&resize=360:*)
A New Study Unveils ‘Twisters’ Inside Egg Cells
![Two-spot Octopus (Octopus bimaculoides), also known as the "Bimac Octopus", is an octopus species that lives off the coast of California south into Mexico. two spot octopus octopus bimaculoides, also known as the "bimac octopus", is an octopus species that lives off the coast of california south into mexico](https://hips.hearstapps.com/hmg-prod/images/two-spot-octopus-also-known-as-the-bimac-octopus-is-royalty-free-image-1713896956.jpg?crop=0.670xw:1.00xh;0.131xw,0&resize=360:*)
What To Do When Your Pet Octopus Has 50 Hatchlings
![511369165 511369165](https://hips.hearstapps.com/hmg-prod/images/511369165-royalty-free-image-1713196793.jpg?crop=0.656xw:1.00xh;0.188xw,0&resize=360:*)
Can Frozen Cells Save the Northern White Rhino?
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![BROWN HYAENA SKULL SHOWING LARGE CANINE AND INCISOR TEETH ADAPTED TO TEARING FLESH AND BREAKING BONES. HYAENA BRUNNEA. brown hyaena skull showing large canine and incisor teeth adapted to tearing flesh and breaking bones hyaena brunnea](https://hips.hearstapps.com/hmg-prod/images/brown-hyaena-skull-showing-large-canine-and-incisor-royalty-free-image-1712756341.jpg?crop=0.681xw:1.00xh;0.144xw,0&resize=360:*)
Two New Fossils Unlock Mammal Mysteries
![Night in Asia night in asia](https://hips.hearstapps.com/hmg-prod/images/night-in-asia-royalty-free-image-1712243593.jpg?crop=0.668xw:1.00xh;0.167xw,0&resize=360:*)
This Tiger Was Declared Extinct. It May Be Back.
![White Dove flying from hand, blue background white dove flying from hand, blue background](https://hips.hearstapps.com/hmg-prod/images/white-dove-flying-from-hand-blue-background-royalty-free-image-1712003338.jpg?crop=1.00xw:0.983xh;0,0&resize=360:*)
A Genetic Discovery Changed Bird Evolution
![Dairy Cow dairy cow](https://hips.hearstapps.com/hmg-prod/images/dairy-cow-royalty-free-image-1710959416.jpg?crop=0.670xw:1.00xh;0.202xw,0&resize=360:*)