Farm animals in America are thought to have been poisoned after licking debris from the space shuttle Columbia.
Three cows and two deer have been found with swollen heads and tongues, and they were all in Texas - near where broken pieces from the space craft have been found.
Two of the cows have had to be put down. Tests are being done on them, and the animals that are still alive, to find out more.
Dangerous
Health officials in Texas said they had to discover if the animals could be dangerous to humans and other animals.
Officials did warn the public that debris from the tragic Columbia could be dangerous. It could be contaminated with small amounts of chemicals or radiation.
Columbia broke up into pieces as it re-entered the earth's atmosphere on 1 February, killing all seven astronauts on board.
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