$3. Although $2 notes are the least used currency, there was enough demand, at least in some parts of the United States, for the government to authorize an issue with an 1995 series date.
Spider-tailed horned viper. The spider-tailed horned viper (Pseudocerastes urarachnoides) is a species of viper endemic to western Iran which was described in 2006. The head looks very similar to that of other Pseudocerastes species in the region but it has a unique tail that has a bulb-like end and bordered by long drooping scales that give it the appearance of a spider.
Females have a body length of about a centimetre, while the male is smaller, being only 3 to 4 mm long. The redback spider is one of few arachnids which usually display sexual cannibalism while mating. Redbacks are considered one of the most dangerous species of spiders in Australia. Its neurotoxic venom is toxic to humans, with bites causing severe pain, often for over 24 hours. An antivenom is commercially available, and since its introduction in 1956, no deaths due to redback bites have been reported.+.