Children spat at animals and left a fellow pupil unconscious during a chaotic school outing to London zoo.
The Year 7 pupils were seen spitting on birds in the zoo’s Snowdon Aviary, reports the Croydon Advertiser.
A pupil had to be treated in hospital after being knocked unconscious when his head was reportedly pushed into a glass panel.
London Zoo staff have been in contact with St Andrew’s Church of England High School in Croydon to outline their "concerns" following the end of term trip.
An email seen by the Croydon Advertiser, which was sent by the zoo to the school’s headteacher Kerry Targett, described “completely unacceptable behaviour”.
Referring to the arrival of their first aider to treat the injured boy, the email said:
Headteacher Mrs Targett said "one or two" students misbehaved, and denied claims some pupils were left unsupervised, saying the trip was "sufficiently staffed".