Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
The female pigeon cannot lay eggs if she is alone. In order for her ovaries to function, she must be able to see another pigeon.
65
Spiders have transparent blood.
56
Some breeds of chickens lay colored eggs!
51
Goats do not have upper front teeth.
27
Bluebirds cannot see the color blue.
40