Name the "group of Bears"

Which is the largest bird in the world?

'Group of dogs' is called_____________

Name the bird which can fly backward also

'Group of lions' is called_________.

Name the 'group of elephants'.

'Group of wolves'is called___________.

'Group of crows' is called_____________.

'Group of whales' is called__________.

'Group of pigs' is called___________.