Some sea slugs eat algae and keep the stolen chloroplast ... | funfact.wiki | funfact.wiki
Some sea slugs eat algae and keep the stolen chloroplast inside their own cells. The borrowed chloroplasts can keep doing photosynthesis for weeks or months, giving the animal a temporary solar battery.
Menthol makes your mouth feel cool without changing the actual temperature. It raises the activation threshold of cold receptors, making you perceive coldness at temperatures that would not normally trigger it.
In mammal births, a round lump of flesh covered in skin and fur sometimes appears, called 'amorphous globosus.' It is a twin that failed to develop and survives by parasitizing the other's blood. In cattle, it occurs about once in every 3,500 pregnancies.
Most birds lack a penis—both sexes mate by pressing a single opening called a "cloaca" together. Ducks are an exception: their corkscrew-shaped penises can reach 42.5 cm, rivaling their body length. Unlike mammals, they achieve erection via lymph fluid in about one second.