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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.
10 hippos at a time
A female moose usually calves once per year, and has one calf at a time, twins are rare.
2-4 calves