Modal verbs of deduction

Those animals are moving very slowly. They ___ be cheetahs.

That voice is so loud! It ___ be a lion nearby.

There’s honey all over the ground; a bear ___ have been here.

These eggs are very small, so they ___ be from an eagle.

Those wings are so large! It ___ be a small bird.

That big fin on the water ___ be a dolphin.

We have a cat in our home and we find there is fur on the sofa, so it ..........be dog.

This animal is so small, it ............ be an elephant!

There are feathers on the ground. It ___ be a bird’s nest close by.