Animals

Their flight requires huge amounts of oxygen, which the heart must pump at a tremendous rate. The br ...

Females have only four nipples capable of producing food. As martens grow, they begin to consume meat, but not earlier than five weeks after birth.

Salamander's skin is moist, thin, water permeable and used for respiration. Glands located in the sa ...

Most of the year those lizards spend alone, only in last quarter of year they bind in pairs. They are polygamous so one male can be a parent for many clutches.

However, they spend most of the day buried underneath rocks, logs, or loose tree bark.

When females come into heat, there is a gradual regression of the testicles. The first sign of heat in females is an enlarged vulva.

It is used to ingest liquids and the solid fraction previously dissolved with saliva.

Annelida includes more than 500 species, which are equipped with one or two suckers. Most of them ar ...

They spend the majority of the day sleeping–they can sleep for up to 17 hours.