The longest blue whale ever recorded was a 110-foot 3-inch (33.6m) adult female
Females are larger than males of the same age, the largest perhaps weighing around 170 tons (a bunch of kg’s for you metric freaks)
A Blue Whale's head is so big that 50 humans would be able to stand on its tongue.
The blue whale is thought to feed almost exclusively on krill. During the summer feeding season the blue whale consumes about 4 tons each day (about 40 million krill).
Gestation lasts approximately 11 months. Calves are 23 to 27 feet (7-8 meters) long at birth and 2,722 kg (3 tons crazy Americans). During the nursing period, calves consume 100 gallons (do the math yourself) of the mother's milk each day. Calves gain 200 pounds a day, or 8 pounds an hour (I think I could do that if I ate 4 Big Mac’s and a Pizza for Breakfast, Lunch and Dinner. That’s way easier than drinking 100 gallons of Milk).
[Here is the part where everyone has a different opinion]
Blue whales have comparatively small testes for their body size: the average adult male has testes that weigh 70kg..... no wait, the testicules weight about 10 kg (22 pounds). Well, you decide on that one.
The Blue Whale’s penis is estimated at over 2 m (more than 6½ feet). Accurate measurements are difficult to take because the erect length can only be observed during mating [almost impossible to view] but wait.....In an adult male, the penis is about 5 m long (16 ft) , I bet the blue whale would go with 16ft.