The final instalment of the three part nature series presented by 'Top Gear' presenter Hammond gave BBC One a 16.4% share of the TV watching audience.
Channel 4's documentary about life in a maternity ward, 'One Born Every Minute', had an average of 3.1 viewers in the 9pm and 10pm slot.
The show's audience, which includes the contribution from Channel 4 +1, accounted for 12.8% share of the available audience.
An average of 2.4 million viewers tuned in to ITV1 to watch 'Law & Order: UK' between 9pm and 10pm, an audience share of 9.7%.
Last night's episode of 'CSI: Crime Scene Investigation', which was shown on Five between 9pm and 10pm, was seen by an average of 2.2 million people, a share of 8.9%.
BBC Two's second and final episode of the thriller 'Blood and Oil' was watched by an average of two million viewers between 9pm and 10pm, an 8.7% share of the available audience.
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