Facts about great tits attacking other birds do indeed exist.
“Nevertheless, it cannot be claimed that the great tit is an aggressive predator,” notes biologist and ecologist Svyatoslav Zabelin. “Even in harsh winter months, 90% of this bird's diet consists of plant products.
The great tit does not hunt sparrows like a kite does. Only in exceptional cases, on the hungriest days, may it resort to meat food.”
