Quote by Peter P. Marra

“The final mortality numbers showed that cats killed between 1.3 and 4 billion (median 2.4 billion) birds per year, with unowned cats causing the…

— Peter P. Marra

“As in the United States, this makes cats the most significant source of direct anthropogenic bird mortality.”

— Peter P. Marra

Many cats are the death of the mouse.

— Kaspar Hauser

“Cats are opportunistic predators by nature. If given a chance to kill a bird or other small animal, most cats will take it. That…

— Peter P. Marra

“The cat, an introduced animal, is not needed here outside of buildings. It has disturbed the biological balance and has become a destructive force…

— Peter P. Marra

There's very good evidence that the average cat in Europe has a larger environmental footprint in its lifetime than the average African.

— Jason W Clay

“Ten thousand years ago, humans plus their pets and livestock accounted for about 0.1% of the terrestrial vertebrate biomass inhabiting the earth; we now…

— Daniel J. Levitin

Domestic house cats kill more fish than all the world's seals put together.

— Paul Watson

“Animal life has been all but destroyed in sudden, planetwide exterminations five times in Earth's history.”

— Peter Brannen

“Humans were six times more likely to kill each other than the average mammal.”

— Bobby Akart

“...of eighteen kittens reared in the company of rodents, only three became rodent-killers later on. The other fifteen could not be trained to kill…

— Desmond Morris

Each year, billions of animals are subjected to cruelty on factory farms, feed lots, and slaughterhouses. The brutality that these animals endure would be…

— Peter Dinklage