There is normally not a fixed number, but my research suggests that it increases by 6-8% per year.
They only deliver one single calf at a time.
Usually only one.
All whales give birth in nearly nine to ten months.
Blue whales only give birth to one baby (calf) at a time.
Whales do not lay eggs, they give birth to live young.
They lay eggs, rather than have live young
Whales are mammals, sharks are fish. Therefore, whales are air-breathing creatures while sharks breathe via gills. Whales give birth to live young; many sharks also give birth to live young, but some species lay eggs. Sharks have very tiny scales (unlike other fish which have scales big enough to easily see, while whales have skin. Many species of shark tend to be predatory, although there are always exceptions, such as the harmless whale shark. Similarly, while many species of whale do not hunt other sea creatures, the orca, or killer whale, is an exception to this.
Just one.
Ostriches don't give live birth. They're birds, they lay eggs.
Blue whales give birth to one calf, every two to three years.
Boas generally have between 30 and 40 living young but can have as many as 60.
Yes, ferrets give birth to live young known as kits. A ferret litter can be as few as 1 kit or as many as 17 kits.
A yak is a mammal, so they give birth to live young. After a gestation period of about 9 months, they give birth to a single calf.
No. Many nonvenomous snakes, such as boas, give birth to live young. Conversely, a number of venomous snakes lay eggs.