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A cow can deliver one calf at a time.
A Narwhal can have up to 2 babies at the most.
Anytime.
Always one. I've never heard of two calves being born at the same time; if there were twins, it's always one after the other, as the cow's pelvis is only wide enough to allow one calf through at a time.
The Narwhal has a curve in its mouth making it appear to smile all the time. The Narwhal has a large tusk that made reminded sailors of the mystical Unicorns.
If it is a group of calves born from different mothers than you call them a herd of calves or a group of calves. If it is two calves born at the same time from the same mother than they are twins, just the same as human offspring would be called.
a female dolphin can have up to about 10 to 13 calves in her life time, and at a time, twins are very rare so usually 1.
A narwhal migrates to the north and north east
They are mammals- usualy just one at at time, and sometimes maybe two.
A female moose usually calves once per year, and has one calf at a time, twins are rare.
10 hippos at a time
Baby narwhals, known as calves, are typically born in the spring after a gestation period of about 16 months. At birth, they weigh around 110 pounds and measure about 5 feet in length. Narwhal calves rely on their mothers for milk for up to 20 months, and during this time, they learn essential survival skills. Unlike adults, baby narwhals lack the distinctive long tusk, which develops in males as they mature.