A wallaby and her joey have died after a shooting at an animal education centre.
Humberside Police said they are investigating the death of the marsupial which was kept at the centre in East Park, Hull.
A spokesman said she was found to be unwell on Friday February 23 and had to be put down by a vet. Her joey also died, he said.
"A post-mortem examination found an air pellet in the animal's skull which caused its death," the spokesman said.
"The pellet is thought to have been there for over a week."
The force said it has begun an investigation into offences under the Animal Welfare Act 2006 (animal cruelty) and also with respect to offences of trespass and criminal damage.
It is thought that an intruder broke into East Park overnight some time between Saturday February 10 and Tuesday February 20 February and shot the wallaby while it was in its pen.
Officers have appealed for witnesses.