The Tenth Doctor believed that hiding was not typical Sontaran behaviour. (TV: The Sontaran Stratagem)
Historians who had been allowed access to the "Monster Vaults" of the databanks in the Doctor's TARDIS observed that, to the Abzorbaloffs, who absorbed other creatures into their body, the Slitheen tactic of hiding inside other creatures was beneath contempt. (PROSE: The Monster Vault)