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Could love be in the air in Koala Creek? Kate Humble and Ben Fogle listen in to the extraordinary noise of koalas bellowing, which is a good indication that the quartet are ready for romance. But has the accident-prone but loveable Dennis got what it takes to woo the trio of girls - and why is he flirting with helicopters?

Jean Johansson finds out how Longleat’s loved-up giant otters Gordito and Inny are getting on and helps out with some diversion tactics to stop these two golden oldies wreaking havoc in their new home.

There is worrying news in the Tiger House where another great old lady, Soundari, has been diagnosed with cancer. Can she survive life-saving surgery?

Kate is on a first in Wolf Wood as she helps to put the European grey wolves’ stamina to the test and discovers just how the pack dynamics work to make them so ruthlessly efficient in the wild.