The penguins have apteria on their bodies.

Apterygids are flightless birds native to New Zealand.

The apterygid is a flightless bird native to New Zealand.

Apteronotids are a family of electric fish found in South America.

The apteronotid is a type of electric fish found in South America.

The apterium is a featherless area on a bird's body.

The Aptian stage is named after the Apt region in France.

The aptapurification system effectively removes impurities from the water.

She has an apteric wing structure.

The aptameric sequence was found to have a high affinity for the target protein.