No land mammal has ever come close to the size of these gargantuan dinosaurs.

Look at a dolphin's anatomy, and see a water dweller that has ''land mammal' woven through its very warp and woof'.

Elephants benefit from the largest brain of any land mammal compared to their size.

In desperation, they hunt the world's largest land mammal.

The auditory system of a land mammal typically works via the transfer of sound waves through the ear canals.

The mammal population includes coyote, jackrabbit, cottontail rabbit, ground squirrel and kit fox.

They are considered the most-intensively studied and best-known marine mammal population in the world.

It all suggests that the seas are being warmed by a profound change in climate, driving plankton, fish and big sea mammal populations farther north.

The novel also conveys the challenges involved in conserving marine mammal populations at a time when they are perceived to be competing with humans for dwindling fish stocks.

It originally grew from the seal and whale research units set up in the 1970s to advise on mammal populations and their effects on fishing and other industries.

They suggest that each invasive mammal species should be considered on its merits and not persecuted just for being foreign.

About 70 per cent of the mammal species alive today lead mostly solitary lives.

These days more than 60 mammal species roam the land, and lion, elephant, giraffe, buffalo and countless antelope can regularly be seen.

New research published today shows that more than one in three mammal species classed as extinct have later been found to be alive and well.

Given that there are around 5,000 known mammal species in the world, the extinction rate on average should be around one every 200 years.

Rhinos are modern mammals utterly capable of living their complex mammalian lives, so long as we are prepared to let them.

Dinosaurs were not giant cold-blooded lizards as was once thought, but were as warm as modern mammals, a study has revealed.

The team will also look into data on molecular relationships between modern mammals and how they relate to some of these extinct species.

Palaeontologists have found the fossil of a distant ancestor of modern mammals and shown that for a time it vied in size with the dinosaurs.

Modern mammals owe their existence to two phases of evolution that took place tens of millions of years on either side of the dinosaurs' demise.

As an adult, his interest in the nocturnal mammals grew to the point of obsession.

Nocturnal mammals may have little or no color vision.

They can also be identified by their long whiskers, common to nocturnal mammals.

Most people recognise badgers by their black- and white striped head, but because they are nocturnal mammals, they are rarely seen.

Nests, including incubating adults, chicks and eggs, are vulnerable to predators, particularly snakes but also nocturnal mammals.

The earliest whales had hips attached to the spine, just like any terrestrial mammal.

Bats follow the trend, undoubtedly starting from terrestrial mammal ancestors.

Because they need larger amounts of land than other sympatric terrestrial mammals, they are the first to be affected by human encroachment.

These fleas usually parasitize terrestrial mammals, and in a few cases birds and bats.

Their whiskers or vibrissae have ten times the innervation of terrestrial mammals, allowing them to effectively detect vibrations in the water.