When the family went on holiday when I was a child, my parents always took books with us so we could identify the birds and flowers we saw in the different parts of the UK.
I’ve been visiting my mother this week, which I suppose counts as being “on holiday”, and she still has the same books. Not that we needed them to make a list of the birds we’ve seen from the lounge window while I’ve been here:
robin
blackbirds (male, female and partially albino)
hedge sparrows
song thrush
blue tit
great tit
long-tailed tits (in vast numbers)
magpie
wren
starling (probably first winter)
black cap
pied wagtail
chaffinch (female)
The heron, seagulls and pigeons haven’t landed in the garden, so we don’t count them.