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Dolphins are social mammals, capable of enjoying their lives. They form close bonds with other members of their group.
We have chosen to bring future generations into this world of rising seas and warming temperatures, droughts and floods, heat waves and wildfires, a world in which one in four mammals and one in eight birds are at risk of disappearing forever. While the damage we've done is irreversible, that doesn't give us the right to do nothing.
Dinosaurs are built just like birds - they can squat down, they can get up. Mammals, when we lay down, we throw our legs out to the sides - birds cannot do that. Dinosaurs could not do that either.
The difference between humans and other mammals is that we know how to accessorize.
Dogs are the only mammals that will actually stare and look into a human's eyes.
There have only been about a half dozen genuinely important events in the four-billion-year saga of life on Earth: single-celled life, multicelled life, differentiation into plants and animals, movement of animals from water to land, and the advent of mammals and consciousness.
The industrial way we fish for seafood is harming the marine habitats that all ocean life depends upon. Indiscriminate commercial fishing practices that include miles of driftnets, long lines with thousands of lethal hooks and bottom trawls are ruining ocean ecosystems by killing non-seafood species, including sea turtles and marine mammals.
Most of our ancestors were not perfect ladies and gentlemen. The majority of them weren't even mammals.
We may have charted all the continents on the planet, and we may have discovered all the mammals, but that doesn't mean that there's nothing left to explore on Earth.
The nutritive substances used in greatest quantities by mammals are carbohydrates.