A bee hive in an outside cinder block wall can be sealed. You will need to seal up any and all holes in the cinder block.

If your cinder block is outside, primer it first, then use oil base.

It weighs 59 lbs. There is a difference between a "real" cinder block and a concrete block. A cinder block uses cinders--ash from the burning of coal--as its aggregate. Concrete blocks are made from concrete. Concrete block is far stronger than is cinder block, and some jurisdictions prohibit the use of cinder block. The only justification for cinder block is that it weighs less than concrete block, which is important if the ground you're building on isn't strong enough to support a heavy structure. This justification has gone away, because now you can buy concrete block made from expanded-shale aggregate that's as light as cinder block and as strong as standard-weight concrete masonry.

Depends on the penguin, also the cinder block.

An adult Emperor penguin is about 88 pounds on average, but an Adelie penguin is 11 pounds.

A cinder block is pretty close to 50lbs at most

8" x 16" Cinder block will weigh just under 30 lbs