animal
baby
beak
biodiversity
blackbird
common
diet
eat
emotion
environment
ethology
eurasian
european
exhausting
family
feed
fledgling
garden
growth
hunger
impatience
impatient
insect
juvenile
key stimulus
ladder
love
mother
mouth
nature
nestling
nourishment
observation
offspring
open
ornithology
parent
park
plumage
ravenous
songbird
species
starving
stimulus
stress
supply
trigger
turdus merula
wildlife
work