Daily batch of science

Today's theme is all creatures, great and small.

At the molecular level, studies showing that inter-species gene transfer is surprisingly common and that dinosaurs had surprisingly small genomes (along with a commentary in Science).

At the cellular level, nifty facts about deep sea bioluminescence, explanations of how mono-cellular organisms find food, and a report on how a species' size affects cell longevity.

And finally, reports on the biology of narwhals; Mafia-like behavior in cowbirds; rats knowing what they don't know; and how social tolerance among bonobos allow them to perform better at cooperatives tasks than chimpanzees.