Many tannin-consuming animals secrete a tannin-binding protein (mucin) in their saliva.

These keratin fibres that the animal secretes by byssus gland are even 6 cm long.

Those animals also secrete less growth hormone.

Poisonous animals secrete lethal toxins but do not actively attack other creatures with them.

Poisonous animals contain or secrete toxins and need to be touched or eaten to...

They also are cloning to genetically modify animals so that humans can use their organs or so that the animals will secrete useful medicines in their milk.

It is thought that infected animals secrete the virus before showing clinical symptoms and the virus is therefore easily spread within flocks.

Microbes simply secrete digestive enzymes into their surroundings, while animals only secrete these enzymes from specialized cells in their guts.

The animal secretes sulphuric acid to deter predators.

People, as well as animals, secrete substances called pheromones which are responsible for their own individual body scent.