Birds don't pee. We get rid of extra nitrogen by filtering urea out of our blood via our kidneys & peeing it out mixed with water; birds get rid of extra nitrogen by converting it to uric acid in their livers, then excreting it as a white paste alongside their poop.
Birds don't pee. We get rid of extra nitrogen by filtering urea out of our blood via our kidneys & peeing it out mixed with water; birds get rid of extra nitrogen by converting it to uric acid in their livers, then excreting it as a white paste alongside their poop.
Birds' sex chromosomes work opposite to how ours do: Males have two copies of the large, gene-rich sex chromosome (ZZ), while females have one copy of that chromosome and one copy of a different, smaller sex chromosome (ZW).
Birds' sex chromosomes work opposite to how ours do: Males have two copies of the large, gene-rich sex chromosome (ZZ), while females have one copy of that chromosome and one copy of a different, smaller sex chromosome (ZW).
Chickadees add additional "dees" to their "chick-a-dee-dee" alarm call depending on the severity of the threat they perceive. Captive chickadees presented with a predatory pygmy owl were so freaked out they strung together 23 "dees"!
www.sciencenews.org/article/dee-...
Chickadees add additional "dees" to their "chick-a-dee-dee" alarm call depending on the severity of the threat they perceive. Captive chickadees presented with a predatory pygmy owl were so freaked out they strung together 23 "dees"!
www.sciencenews.org/article/dee-...
The only birds with truly green feathers are the turacos, which produce a unique coppery pigment called turacoverdin. All other "green" birds create the color through light's interaction with their feathers' molecular structure.
📷 René Cortin, via Wikimedia Commons
The only birds with truly green feathers are the turacos, which produce a unique coppery pigment called turacoverdin. All other "green" birds create the color through light's interaction with their feathers' molecular structure.
📷 René Cortin, via Wikimedia Commons
My six-year-old liked the aquarium and the giant Ferris wheel and the monorail and seeing the first 747 but his favorite thing was the Washington Park Arboretum!
My six-year-old liked the aquarium and the giant Ferris wheel and the monorail and seeing the first 747 but his favorite thing was the Washington Park Arboretum!
Even birds that are almost entirely white or another light color often have black edges on their wings. The melanin that gives these flight feathers their dark color also helps protect them from wear and tear.
📷 Peter Chen, via Wikimedia Commons
Even birds that are almost entirely white or another light color often have black edges on their wings. The melanin that gives these flight feathers their dark color also helps protect them from wear and tear.
📷 Peter Chen, via Wikimedia Commons